diff --git a/build/build.js b/build/build.js
index 0de786828..483047765 100644
--- a/build/build.js
+++ b/build/build.js
@@ -1,13 +1,13 @@
-const rollup = require('rollup')
-const buble = require('rollup-plugin-buble')
-const commonjs = require('rollup-plugin-commonjs')
-const nodeResolve = require('rollup-plugin-node-resolve')
-const { uglify } = require('rollup-plugin-uglify')
-const replace = require('rollup-plugin-replace')
-const isProd = process.env.NODE_ENV === 'production'
-const version = process.env.VERSION || require('../package.json').version
-const chokidar = require('chokidar')
-const path = require('path')
+const rollup = require('rollup');
+const buble = require('rollup-plugin-buble');
+const commonjs = require('rollup-plugin-commonjs');
+const nodeResolve = require('rollup-plugin-node-resolve');
+const { terser } = require('rollup-plugin-terser');
+const replace = require('rollup-plugin-replace');
+const isProd = process.env.NODE_ENV === 'production';
+const version = process.env.VERSION || require('../package.json').version;
+const chokidar = require('chokidar');
+const path = require('path');
 
 /**
  * @param {{
@@ -24,89 +24,100 @@ async function build(opts) {
       plugins: (opts.plugins || []).concat([
         buble({
           transforms: {
-            dangerousForOf: true
-          }}),
+            dangerousForOf: true,
+          },
+        }),
         commonjs(),
         nodeResolve(),
         replace({
           __VERSION__: version,
-          'process.env.SSR': false
-        })
+          'process.env.SSR': false,
+        }),
       ]),
       onwarn: function (message) {
         if (message.code === 'UNRESOLVED_IMPORT') {
           throw new Error(
             `Could not resolve module ` +
-            message.source +
-            `. Try running 'npm install' or using rollup's 'external' option if this is an external dependency. ` +
-            `Module ${message.source} is imported in ${message.importer}`
-            )
+              message.source +
+              `. Try running 'npm install' or using rollup's 'external' option if this is an external dependency. ` +
+              `Module ${message.source} is imported in ${message.importer}`
+          );
         }
-      }
+      },
     })
     .then(function (bundle) {
-      var dest = 'lib/' + (opts.output || opts.input)
+      var dest = 'lib/' + (opts.output || opts.input);
 
-      console.log(dest)
+      console.log(dest);
       return bundle.write({
         format: 'iife',
-        output: opts.globalName ? {name: opts.globalName} : {},
+        output: {
+          name: opts.globalName || null,
+          file: dest,
+        },
         file: dest,
-        strict: false
-      })
-    })
+        strict: false,
+      });
+    });
 }
 
 async function buildCore() {
-  const promises = []
+  const promises = [];
 
-  promises.push(build({
-    input: 'src/core/index.js',
-    output: 'docsify.js',
-  }))
+  promises.push(
+    build({
+      input: 'src/core/index.js',
+      output: 'docsify.js',
+    })
+  );
 
   if (isProd) {
-    promises.push(build({
-      input: 'src/core/index.js',
-      output: 'docsify.min.js',
-      plugins: [uglify()]
-    }))
+    promises.push(
+      build({
+        input: 'src/core/index.js',
+        output: 'docsify.min.js',
+        plugins: [terser()],
+      })
+    );
   }
 
-  await Promise.all(promises)
+  await Promise.all(promises);
 }
 
 async function buildAllPlugin() {
   var plugins = [
-    {name: 'search', input: 'search/index.js'},
-    {name: 'ga', input: 'ga.js'},
-    {name: 'matomo', input: 'matomo.js'},
-    {name: 'emoji', input: 'emoji.js'},
-    {name: 'external-script', input: 'external-script.js'},
-    {name: 'front-matter', input: 'front-matter/index.js'},
-    {name: 'zoom-image', input: 'zoom-image.js'},
-    {name: 'disqus', input: 'disqus.js'},
-    {name: 'gitalk', input: 'gitalk.js'}
-  ]
+    { name: 'search', input: 'search/index.js' },
+    { name: 'ga', input: 'ga.js' },
+    { name: 'gtag', input: 'gtag.js' },
+    { name: 'matomo', input: 'matomo.js' },
+    { name: 'emoji', input: 'emoji.js' },
+    { name: 'external-script', input: 'external-script.js' },
+    { name: 'front-matter', input: 'front-matter/index.js' },
+    { name: 'zoom-image', input: 'zoom-image.js' },
+    { name: 'disqus', input: 'disqus.js' },
+    { name: 'gitalk', input: 'gitalk.js' },
+  ];
 
   const promises = plugins.map(item => {
     return build({
       input: 'src/plugins/' + item.input,
-      output: 'plugins/' + item.name + '.js'
-    })
-  })
+      output: 'plugins/' + item.name + '.js',
+    });
+  });
 
   if (isProd) {
     plugins.forEach(item => {
-      promises.push(build({
-        input: 'src/plugins/' + item.input,
-        output: 'plugins/' + item.name + '.min.js',
-        plugins: [uglify()]
-      }))
-    })
+      promises.push(
+        build({
+          input: 'src/plugins/' + item.input,
+          output: 'plugins/' + item.name + '.min.js',
+          plugins: [terser()],
+        })
+      );
+    });
   }
 
-  await Promise.all(promises)
+  await Promise.all(promises);
 }
 
 async function main() {
@@ -116,41 +127,37 @@ async function main() {
         atomic: true,
         awaitWriteFinish: {
           stabilityThreshold: 1000,
-          pollInterval: 100
-        }
+          pollInterval: 100,
+        },
       })
       .on('change', p => {
-        console.log('[watch] ', p)
-        const dirs = p.split(path.sep)
+        console.log('[watch] ', p);
+        const dirs = p.split(path.sep);
         if (dirs[1] === 'core') {
-          buildCore()
+          buildCore();
         } else if (dirs[2]) {
-          const name = path.basename(dirs[2], '.js')
+          const name = path.basename(dirs[2], '.js');
           const input = `src/plugins/${name}${
             /\.js/.test(dirs[2]) ? '' : '/index'
-          }.js`
+          }.js`;
 
           build({
             input,
-            output: 'plugins/' + name + '.js'
-          })
+            output: 'plugins/' + name + '.js',
+          });
         }
       })
       .on('ready', () => {
-        console.log('[start]')
-        buildCore()
-        buildAllPlugin()
-      })
+        console.log('[start]');
+        buildCore();
+        buildAllPlugin();
+      });
   } else {
-    await Promise.all([
-      buildCore(),
-      buildAllPlugin()
-    ])
+    await Promise.all([buildCore(), buildAllPlugin()]);
   }
 }
 
-main().catch((e) => {
-  console.error(e)
-  process.exit(1)
-})
-
+main().catch(e => {
+  console.error(e);
+  process.exit(1);
+});
diff --git a/docs/plugins.md b/docs/plugins.md
index 3db7ff56b..dce1f4e64 100644
--- a/docs/plugins.md
+++ b/docs/plugins.md
@@ -71,6 +71,8 @@ This plugin ignores diacritical marks when performing a full text search (e.g.,
 
 ## Google Analytics
 
+> Google's Universal Analytics service will no longer process new data in standard properties beginning July 1, 2023. Prepare now by setting up and switching over to a Google Analytics 4 property and docsify's gtag.js plugin.
+
 Install the plugin and configure the track id.
 
 ```html
@@ -91,6 +93,31 @@ Configure by `data-ga`.
 <script src="//cdn.jsdelivr.net/npm/docsify/lib/plugins/ga.min.js"></script>
 ```
 
+## Google Analytics 4 (GA4)
+
+Install the plugin and configure the track id.
+
+```html
+<script>
+  // Single ID
+  window.$docsify = {
+    gtag: 'UA-XXXXX-Y',
+  };
+
+  // Multiple IDs
+  window.$docsify = {
+    gtag: [
+      'G-XXXXXXXX', // Google Analytics 4 (GA4)
+      'UA-XXXXXXXX', // Google Universal Analytics (GA3)
+      'AW-XXXXXXXX', // Google Ads
+      'DC-XXXXXXXX', // Floodlight
+    ],
+  };
+</script>
+<script src="//cdn.jsdelivr.net/npm/docsify/lib/docsify.min.js"></script>
+<script src="//cdn.jsdelivr.net/npm/docsify/lib/plugins/gtag.min.js"></script>
+```
+
 ## Emoji
 
 Renders a larger collection of emoji shorthand codes. Without this plugin, Docsify is able to render only a limited number of emoji shorthand codes.
diff --git a/package-lock.json b/package-lock.json
index 2212e07e0..675133849 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -48,13 +48,13 @@
         "npm-run-all": "^4.1.5",
         "prettier": "^2.5.1",
         "rimraf": "^3.0.0",
-        "rollup": "^1.23.1",
+        "rollup": "^2.77.2",
         "rollup-plugin-async": "^1.2.0",
         "rollup-plugin-buble": "^0.19.8",
         "rollup-plugin-commonjs": "^10.1.0",
         "rollup-plugin-node-resolve": "^5.2.0",
         "rollup-plugin-replace": "^2.2.0",
-        "rollup-plugin-uglify": "^6.0.4",
+        "rollup-plugin-terser": "^7.0.2",
         "serve-handler": "^6.1.2",
         "stylus": "^0.54.5",
         "vue2": "npm:vue@^2.6.12",
@@ -2777,6 +2777,64 @@
         "node": ">=8"
       }
     },
+    "node_modules/@jridgewell/gen-mapping": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.2.tgz",
+      "integrity": "sha512-mh65xKQAzI6iBcFzwv28KVWSmCkdRBWoOh+bYQGW3+6OZvbbN3TqMGo5hqYxQniRcH9F2VZIoJCm4pa3BPDK/A==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/set-array": "^1.0.1",
+        "@jridgewell/sourcemap-codec": "^1.4.10",
+        "@jridgewell/trace-mapping": "^0.3.9"
+      },
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.0.tgz",
+      "integrity": "sha512-F2msla3tad+Mfht5cJq7LSXcdudKTWCVYUgw6pLFOOHSTtZlj6SWNYAp+AhuqLmWdBO2X5hPrLcu8cVP8fy28w==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@jridgewell/set-array": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/set-array/-/set-array-1.1.2.tgz",
+      "integrity": "sha512-xnkseuNADM0gt2bs+BvhO0p78Mk762YnZdsuzFV018NoG1Sj1SCQvpSqa7XUaTam5vAGasABV9qXASMKnFMwMw==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@jridgewell/source-map": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/source-map/-/source-map-0.3.2.tgz",
+      "integrity": "sha512-m7O9o2uR8k2ObDysZYzdfhb08VuEml5oWGiosa1VdaPZ/A6QyPkAJuwN0Q1lhULOf6B7MtQmHENS743hWtCrgw==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/gen-mapping": "^0.3.0",
+        "@jridgewell/trace-mapping": "^0.3.9"
+      }
+    },
+    "node_modules/@jridgewell/sourcemap-codec": {
+      "version": "1.4.14",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.14.tgz",
+      "integrity": "sha512-XPSJHWmi394fuUuzDnGz1wiKqWfo1yXecHQMRf2l6hztTO+nPru658AyDngaBe7isIxEkRsPR3FZh+s7iVa4Uw==",
+      "dev": true
+    },
+    "node_modules/@jridgewell/trace-mapping": {
+      "version": "0.3.14",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.14.tgz",
+      "integrity": "sha512-bJWEfQ9lPTvm3SneWwRFVLzrh6nhjwqw7TUFFBEMzwvg7t7PCDenf2lDwqo4NQXzdpgBXyFgDWnQA+2vkruksQ==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.0.3",
+        "@jridgewell/sourcemap-codec": "^1.4.10"
+      }
+    },
     "node_modules/@lerna/add": {
       "version": "3.21.0",
       "resolved": "https://registry.npmjs.org/@lerna/add/-/add-3.21.0.tgz",
@@ -20504,6 +20562,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/randombytes": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz",
+      "integrity": "sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==",
+      "dev": true,
+      "dependencies": {
+        "safe-buffer": "^5.1.0"
+      }
+    },
     "node_modules/range-parser": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
@@ -21232,23 +21299,24 @@
       }
     },
     "node_modules/rollup": {
-      "version": "1.32.1",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.32.1.tgz",
-      "integrity": "sha512-/2HA0Ec70TvQnXdzynFffkjA6XN+1e2pEv/uKS5Ulca40g2L7KuOE3riasHoNVHOsFD5KKZgDsMk1CP3Tw9s+A==",
+      "version": "2.77.2",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.77.2.tgz",
+      "integrity": "sha512-m/4YzYgLcpMQbxX3NmAqDvwLATZzxt8bIegO78FZLl+lAgKJBd1DRAOeEiZcKOIOPjxE6ewHWHNgGEalFXuz1g==",
       "dev": true,
-      "dependencies": {
-        "@types/estree": "*",
-        "@types/node": "*",
-        "acorn": "^7.1.0"
-      },
       "bin": {
         "rollup": "dist/bin/rollup"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.2"
       }
     },
     "node_modules/rollup-plugin-async": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/rollup-plugin-async/-/rollup-plugin-async-1.2.0.tgz",
-      "integrity": "sha1-+V/dKfi28jMrWomp1k7oCHsSskk=",
+      "integrity": "sha512-5/LCGFDejG5OwfiNp377VqMjLQz87LBs4cXUfNiHHxrwd9RixiGgFDfv/4+KD9eKENr/bmUVwFRgMsL2mJW7Ag==",
       "dev": true,
       "dependencies": {
         "async-to-gen": "^1.2.0",
@@ -21365,44 +21433,54 @@
         "estree-walker": "^0.6.1"
       }
     },
-    "node_modules/rollup-plugin-uglify": {
-      "version": "6.0.4",
-      "resolved": "https://registry.npmjs.org/rollup-plugin-uglify/-/rollup-plugin-uglify-6.0.4.tgz",
-      "integrity": "sha512-ddgqkH02klveu34TF0JqygPwZnsbhHVI6t8+hGTcYHngPkQb5MIHI0XiztXIN/d6V9j+efwHAqEL7LspSxQXGw==",
+    "node_modules/rollup-plugin-terser": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/rollup-plugin-terser/-/rollup-plugin-terser-7.0.2.tgz",
+      "integrity": "sha512-w3iIaU4OxcF52UUXiZNsNeuXIMDvFrr+ZXK6bFZ0Q60qyVfq4uLptoS4bbq3paG3x216eQllFZX7zt6TIImguQ==",
       "dev": true,
       "dependencies": {
-        "@babel/code-frame": "^7.0.0",
-        "jest-worker": "^24.0.0",
-        "serialize-javascript": "^2.1.2",
-        "uglify-js": "^3.4.9"
+        "@babel/code-frame": "^7.10.4",
+        "jest-worker": "^26.2.1",
+        "serialize-javascript": "^4.0.0",
+        "terser": "^5.0.0"
       },
       "peerDependencies": {
-        "rollup": ">=0.66.0 <2"
+        "rollup": "^2.0.0"
       }
     },
-    "node_modules/rollup-plugin-uglify/node_modules/jest-worker": {
-      "version": "24.9.0",
-      "resolved": "https://registry.npmjs.org/jest-worker/-/jest-worker-24.9.0.tgz",
-      "integrity": "sha512-51PE4haMSXcHohnSMdM42anbvZANYTqMrr52tVKPqqsPJMzoP6FYYDVqahX/HrAoKEKz3uUPzSvKs9A3qR4iVw==",
+    "node_modules/rollup-plugin-terser/node_modules/has-flag": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
+      "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/rollup-plugin-terser/node_modules/jest-worker": {
+      "version": "26.6.2",
+      "resolved": "https://registry.npmjs.org/jest-worker/-/jest-worker-26.6.2.tgz",
+      "integrity": "sha512-KWYVV1c4i+jbMpaBC+U++4Va0cp8OisU185o73T1vo99hqi7w8tSJfUXYswwqqrjzwxa6KpRK54WhPvwf5w6PQ==",
       "dev": true,
       "dependencies": {
+        "@types/node": "*",
         "merge-stream": "^2.0.0",
-        "supports-color": "^6.1.0"
+        "supports-color": "^7.0.0"
       },
       "engines": {
-        "node": ">= 6"
+        "node": ">= 10.13.0"
       }
     },
-    "node_modules/rollup-plugin-uglify/node_modules/supports-color": {
-      "version": "6.1.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
-      "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+    "node_modules/rollup-plugin-terser/node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
       "dev": true,
       "dependencies": {
-        "has-flag": "^3.0.0"
+        "has-flag": "^4.0.0"
       },
       "engines": {
-        "node": ">=6"
+        "node": ">=8"
       }
     },
     "node_modules/rollup-pluginutils": {
@@ -21421,18 +21499,6 @@
       "integrity": "sha1-va/oCVOD2EFNXcLs9MkXO225QS4=",
       "dev": true
     },
-    "node_modules/rollup/node_modules/acorn": {
-      "version": "7.4.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
-      "integrity": "sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==",
-      "dev": true,
-      "bin": {
-        "acorn": "bin/acorn"
-      },
-      "engines": {
-        "node": ">=0.4.0"
-      }
-    },
     "node_modules/run-async": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
@@ -21658,10 +21724,13 @@
       }
     },
     "node_modules/serialize-javascript": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-2.1.2.tgz",
-      "integrity": "sha512-rs9OggEUF0V4jUSecXazOYsLfu7OGK2qIn3c7IPBiffz32XniEp/TX9Xmc9LQfK2nQ2QKHvZ2oygKUGU0lG4jQ==",
-      "dev": true
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-4.0.0.tgz",
+      "integrity": "sha512-GaNA54380uFefWghODBWEGisLZFj00nS5ACs6yHa9nLqlLpVLO8ChDGeKRjZnV4Nh4n0Qi7nhYZD/9fCPzEqkw==",
+      "dev": true,
+      "dependencies": {
+        "randombytes": "^2.1.0"
+      }
     },
     "node_modules/serve-handler": {
       "version": "6.1.3",
@@ -23341,6 +23410,42 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/terser": {
+      "version": "5.14.2",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-5.14.2.tgz",
+      "integrity": "sha512-oL0rGeM/WFQCUd0y2QrWxYnq7tfSuKBiqTjRPWrRgB46WD/kiwHwF8T23z78H6Q6kGCuuHcPB+KULHRdxvVGQA==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/source-map": "^0.3.2",
+        "acorn": "^8.5.0",
+        "commander": "^2.20.0",
+        "source-map-support": "~0.5.20"
+      },
+      "bin": {
+        "terser": "bin/terser"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/terser/node_modules/acorn": {
+      "version": "8.8.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.8.0.tgz",
+      "integrity": "sha512-QOxyigPVrpZ2GXT+PFyZTl6TtOFc5egxHIP9IlQ+RbupQuX4RkT/Bee4/kQuC02Xkzg84JcT7oLYtDIQxp+v7w==",
+      "dev": true,
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/terser/node_modules/commander": {
+      "version": "2.20.3",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
+      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
+      "dev": true
+    },
     "node_modules/test-exclude": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
@@ -23797,6 +23902,7 @@
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.14.5.tgz",
       "integrity": "sha512-qZukoSxOG0urUTvjc2ERMTcAy+BiFh3weWAkeurLwjrCba73poHmG3E36XEjd/JGukMzwTL7uCxZiAexj8ppvQ==",
       "dev": true,
+      "optional": true,
       "bin": {
         "uglifyjs": "bin/uglifyjs"
       },
@@ -26794,6 +26900,55 @@
         }
       }
     },
+    "@jridgewell/gen-mapping": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.2.tgz",
+      "integrity": "sha512-mh65xKQAzI6iBcFzwv28KVWSmCkdRBWoOh+bYQGW3+6OZvbbN3TqMGo5hqYxQniRcH9F2VZIoJCm4pa3BPDK/A==",
+      "dev": true,
+      "requires": {
+        "@jridgewell/set-array": "^1.0.1",
+        "@jridgewell/sourcemap-codec": "^1.4.10",
+        "@jridgewell/trace-mapping": "^0.3.9"
+      }
+    },
+    "@jridgewell/resolve-uri": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.0.tgz",
+      "integrity": "sha512-F2msla3tad+Mfht5cJq7LSXcdudKTWCVYUgw6pLFOOHSTtZlj6SWNYAp+AhuqLmWdBO2X5hPrLcu8cVP8fy28w==",
+      "dev": true
+    },
+    "@jridgewell/set-array": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/set-array/-/set-array-1.1.2.tgz",
+      "integrity": "sha512-xnkseuNADM0gt2bs+BvhO0p78Mk762YnZdsuzFV018NoG1Sj1SCQvpSqa7XUaTam5vAGasABV9qXASMKnFMwMw==",
+      "dev": true
+    },
+    "@jridgewell/source-map": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/source-map/-/source-map-0.3.2.tgz",
+      "integrity": "sha512-m7O9o2uR8k2ObDysZYzdfhb08VuEml5oWGiosa1VdaPZ/A6QyPkAJuwN0Q1lhULOf6B7MtQmHENS743hWtCrgw==",
+      "dev": true,
+      "requires": {
+        "@jridgewell/gen-mapping": "^0.3.0",
+        "@jridgewell/trace-mapping": "^0.3.9"
+      }
+    },
+    "@jridgewell/sourcemap-codec": {
+      "version": "1.4.14",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.14.tgz",
+      "integrity": "sha512-XPSJHWmi394fuUuzDnGz1wiKqWfo1yXecHQMRf2l6hztTO+nPru658AyDngaBe7isIxEkRsPR3FZh+s7iVa4Uw==",
+      "dev": true
+    },
+    "@jridgewell/trace-mapping": {
+      "version": "0.3.14",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.14.tgz",
+      "integrity": "sha512-bJWEfQ9lPTvm3SneWwRFVLzrh6nhjwqw7TUFFBEMzwvg7t7PCDenf2lDwqo4NQXzdpgBXyFgDWnQA+2vkruksQ==",
+      "dev": true,
+      "requires": {
+        "@jridgewell/resolve-uri": "^3.0.3",
+        "@jridgewell/sourcemap-codec": "^1.4.10"
+      }
+    },
     "@lerna/add": {
       "version": "3.21.0",
       "resolved": "https://registry.npmjs.org/@lerna/add/-/add-3.21.0.tgz",
@@ -41052,6 +41207,15 @@
       "integrity": "sha512-ARhCpm70fzdcvNQfPoy49IaanKkTlRWF2JMzqhcJbhSFRZv7nPTvZJdcY7301IPmvW+/p0RgIWnQDLJxifsQ7g==",
       "dev": true
     },
+    "randombytes": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz",
+      "integrity": "sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "^5.1.0"
+      }
+    },
     "range-parser": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
@@ -41640,28 +41804,18 @@
       }
     },
     "rollup": {
-      "version": "1.32.1",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.32.1.tgz",
-      "integrity": "sha512-/2HA0Ec70TvQnXdzynFffkjA6XN+1e2pEv/uKS5Ulca40g2L7KuOE3riasHoNVHOsFD5KKZgDsMk1CP3Tw9s+A==",
+      "version": "2.77.2",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.77.2.tgz",
+      "integrity": "sha512-m/4YzYgLcpMQbxX3NmAqDvwLATZzxt8bIegO78FZLl+lAgKJBd1DRAOeEiZcKOIOPjxE6ewHWHNgGEalFXuz1g==",
       "dev": true,
       "requires": {
-        "@types/estree": "*",
-        "@types/node": "*",
-        "acorn": "^7.1.0"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "7.4.1",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
-          "integrity": "sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==",
-          "dev": true
-        }
+        "fsevents": "~2.3.2"
       }
     },
     "rollup-plugin-async": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/rollup-plugin-async/-/rollup-plugin-async-1.2.0.tgz",
-      "integrity": "sha1-+V/dKfi28jMrWomp1k7oCHsSskk=",
+      "integrity": "sha512-5/LCGFDejG5OwfiNp377VqMjLQz87LBs4cXUfNiHHxrwd9RixiGgFDfv/4+KD9eKENr/bmUVwFRgMsL2mJW7Ag==",
       "dev": true,
       "requires": {
         "async-to-gen": "^1.2.0",
@@ -41776,35 +41930,42 @@
         }
       }
     },
-    "rollup-plugin-uglify": {
-      "version": "6.0.4",
-      "resolved": "https://registry.npmjs.org/rollup-plugin-uglify/-/rollup-plugin-uglify-6.0.4.tgz",
-      "integrity": "sha512-ddgqkH02klveu34TF0JqygPwZnsbhHVI6t8+hGTcYHngPkQb5MIHI0XiztXIN/d6V9j+efwHAqEL7LspSxQXGw==",
+    "rollup-plugin-terser": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/rollup-plugin-terser/-/rollup-plugin-terser-7.0.2.tgz",
+      "integrity": "sha512-w3iIaU4OxcF52UUXiZNsNeuXIMDvFrr+ZXK6bFZ0Q60qyVfq4uLptoS4bbq3paG3x216eQllFZX7zt6TIImguQ==",
       "dev": true,
       "requires": {
-        "@babel/code-frame": "^7.0.0",
-        "jest-worker": "^24.0.0",
-        "serialize-javascript": "^2.1.2",
-        "uglify-js": "^3.4.9"
+        "@babel/code-frame": "^7.10.4",
+        "jest-worker": "^26.2.1",
+        "serialize-javascript": "^4.0.0",
+        "terser": "^5.0.0"
       },
       "dependencies": {
+        "has-flag": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
+          "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+          "dev": true
+        },
         "jest-worker": {
-          "version": "24.9.0",
-          "resolved": "https://registry.npmjs.org/jest-worker/-/jest-worker-24.9.0.tgz",
-          "integrity": "sha512-51PE4haMSXcHohnSMdM42anbvZANYTqMrr52tVKPqqsPJMzoP6FYYDVqahX/HrAoKEKz3uUPzSvKs9A3qR4iVw==",
+          "version": "26.6.2",
+          "resolved": "https://registry.npmjs.org/jest-worker/-/jest-worker-26.6.2.tgz",
+          "integrity": "sha512-KWYVV1c4i+jbMpaBC+U++4Va0cp8OisU185o73T1vo99hqi7w8tSJfUXYswwqqrjzwxa6KpRK54WhPvwf5w6PQ==",
           "dev": true,
           "requires": {
+            "@types/node": "*",
             "merge-stream": "^2.0.0",
-            "supports-color": "^6.1.0"
+            "supports-color": "^7.0.0"
           }
         },
         "supports-color": {
-          "version": "6.1.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
-          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
           "dev": true,
           "requires": {
-            "has-flag": "^3.0.0"
+            "has-flag": "^4.0.0"
           }
         }
       }
@@ -42009,10 +42170,13 @@
       }
     },
     "serialize-javascript": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-2.1.2.tgz",
-      "integrity": "sha512-rs9OggEUF0V4jUSecXazOYsLfu7OGK2qIn3c7IPBiffz32XniEp/TX9Xmc9LQfK2nQ2QKHvZ2oygKUGU0lG4jQ==",
-      "dev": true
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-4.0.0.tgz",
+      "integrity": "sha512-GaNA54380uFefWghODBWEGisLZFj00nS5ACs6yHa9nLqlLpVLO8ChDGeKRjZnV4Nh4n0Qi7nhYZD/9fCPzEqkw==",
+      "dev": true,
+      "requires": {
+        "randombytes": "^2.1.0"
+      }
     },
     "serve-handler": {
       "version": "6.1.3",
@@ -43369,6 +43533,32 @@
         }
       }
     },
+    "terser": {
+      "version": "5.14.2",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-5.14.2.tgz",
+      "integrity": "sha512-oL0rGeM/WFQCUd0y2QrWxYnq7tfSuKBiqTjRPWrRgB46WD/kiwHwF8T23z78H6Q6kGCuuHcPB+KULHRdxvVGQA==",
+      "dev": true,
+      "requires": {
+        "@jridgewell/source-map": "^0.3.2",
+        "acorn": "^8.5.0",
+        "commander": "^2.20.0",
+        "source-map-support": "~0.5.20"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "8.8.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.8.0.tgz",
+          "integrity": "sha512-QOxyigPVrpZ2GXT+PFyZTl6TtOFc5egxHIP9IlQ+RbupQuX4RkT/Bee4/kQuC02Xkzg84JcT7oLYtDIQxp+v7w==",
+          "dev": true
+        },
+        "commander": {
+          "version": "2.20.3",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
+          "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
+          "dev": true
+        }
+      }
+    },
     "test-exclude": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
@@ -43727,7 +43917,8 @@
       "version": "3.14.5",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.14.5.tgz",
       "integrity": "sha512-qZukoSxOG0urUTvjc2ERMTcAy+BiFh3weWAkeurLwjrCba73poHmG3E36XEjd/JGukMzwTL7uCxZiAexj8ppvQ==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "uid-number": {
       "version": "0.0.6",
diff --git a/package.json b/package.json
index bca7700db..5ffac4444 100644
--- a/package.json
+++ b/package.json
@@ -103,13 +103,13 @@
     "npm-run-all": "^4.1.5",
     "prettier": "^2.5.1",
     "rimraf": "^3.0.0",
-    "rollup": "^1.23.1",
+    "rollup": "^2.77.2",
     "rollup-plugin-async": "^1.2.0",
     "rollup-plugin-buble": "^0.19.8",
     "rollup-plugin-commonjs": "^10.1.0",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-replace": "^2.2.0",
-    "rollup-plugin-uglify": "^6.0.4",
+    "rollup-plugin-terser": "^7.0.2",
     "serve-handler": "^6.1.2",
     "stylus": "^0.54.5",
     "vue2": "npm:vue@^2.6.12",
diff --git a/src/plugins/gtag.js b/src/plugins/gtag.js
new file mode 100644
index 000000000..aec713cb7
--- /dev/null
+++ b/src/plugins/gtag.js
@@ -0,0 +1,72 @@
+/* eslint-disable no-console */
+// From ./ga.js
+
+function appendScript(id) {
+  const script = document.createElement('script');
+  script.async = true;
+  script.src = 'https://www.googletagmanager.com/gtag/js?id=' + id;
+  document.body.appendChild(script);
+}
+
+// global site tag instance initialized
+function initGlobalSiteTag(id) {
+  appendScript(id);
+
+  window.dataLayer = window.dataLayer || [];
+  window.gtag =
+    window.gtag ||
+    function () {
+      window.dataLayer.push(arguments);
+    };
+
+  window.gtag('js', new Date());
+  window.gtag('config', id);
+}
+
+// add additional products to your tag
+// https://developers.google.com/tag-platform/gtagjs/install
+function initAdditionalTag(id) {
+  window.gtag('config', id);
+}
+
+function init(ids) {
+  if (Array.isArray(ids)) {
+    // set the first id to be a global site tag
+    initGlobalSiteTag(ids[0]);
+
+    // the rest ids
+    ids.forEach((id, index) => {
+      if (index > 0) {
+        initAdditionalTag(id);
+      }
+    });
+  } else {
+    initGlobalSiteTag(ids);
+  }
+}
+
+function collect() {
+  if (!window.gtag) {
+    init($docsify.gtag);
+  }
+
+  // usage: https://developers.google.com/analytics/devguides/collection/gtagjs/pages
+  window.gtag('event', 'page_view', {
+    /* eslint-disable camelcase */
+    page_title: document.title,
+    page_location: location.href,
+    page_path: location.pathname,
+    /* eslint-disable camelcase */
+  });
+}
+
+const install = function (hook) {
+  if (!$docsify.gtag) {
+    console.error('[Docsify] gtag is required.');
+    return;
+  }
+
+  hook.beforeEach(collect);
+};
+
+$docsify.plugins = [].concat(install, $docsify.plugins);
diff --git a/test/e2e/gtag.test.js b/test/e2e/gtag.test.js
new file mode 100644
index 000000000..c3ebbcd18
--- /dev/null
+++ b/test/e2e/gtag.test.js
@@ -0,0 +1,97 @@
+// Modules, constants, and variables
+// npm run test:e2e gtag.test.js
+// -----------------------------------------------------------------------------
+const docsifyInit = require('../helpers/docsify-init');
+const { test, expect } = require('./fixtures/docsify-init-fixture');
+
+const gtagList = [
+  'AW-YYYYYY', // Google Ads
+  'DC-ZZZZZZ', // Floodlight
+  'G-XXXXXX', // Google Analytics 4 (GA4)
+  'UA-XXXXXX', // Google Universal Analytics (GA3)
+];
+
+// Suite
+// -----------------------------------------------------------------------------
+test.describe('Gtag Plugin Tests', () => {
+  // page request listened, print collect url
+  function pageRequestListened(page) {
+    page.on('request', request => {
+      if (request.url().indexOf('www.google-analytics.com') !== -1) {
+        // console.log(request.url());
+      }
+    });
+
+    page.on('response', response => {
+      const request = response.request();
+      // googleads.g.doubleclick.net
+      // www.google-analytics.com
+      // www.googletagmanager.com
+      const reg =
+        /googleads\.g\.doubleclick\.net|www\.google-analytics\.com|www\.googletagmanager\.com/g;
+      if (request.url().match(reg)) {
+        // console.log(request.url(), response.status());
+      }
+    });
+  }
+
+  // Tests
+  // ---------------------------------------------------------------------------
+  test('single gtag', async ({ page }) => {
+    pageRequestListened(page);
+
+    const docsifyInitConfig = {
+      config: {
+        gtag: gtagList[0],
+      },
+      scriptURLs: ['/lib/plugins/gtag.min.js'],
+      styleURLs: ['/lib/themes/vue.css'],
+    };
+
+    await docsifyInit({
+      ...docsifyInitConfig,
+    });
+
+    const $docsify = await page.evaluate(() => window.$docsify);
+
+    // Verify config options
+    expect(typeof $docsify).toEqual('object');
+
+    // console.log($docsify.gtag, $docsify.gtag === '');
+
+    // Tests
+    expect($docsify.gtag).not.toEqual('');
+  });
+
+  test('multi gtag', async ({ page }) => {
+    pageRequestListened(page);
+
+    const docsifyInitConfig = {
+      config: {
+        gtag: gtagList,
+      },
+      scriptURLs: ['/lib/plugins/gtag.min.js'],
+      styleURLs: ['/lib/themes/vue.css'],
+    };
+
+    await docsifyInit({
+      ...docsifyInitConfig,
+    });
+
+    const $docsify = await page.evaluate(() => window.$docsify);
+
+    // Verify config options
+    expect(typeof $docsify).toEqual('object');
+
+    // console.log($docsify.gtag, $docsify.gtag === '');
+
+    // Tests
+    expect($docsify.gtag).not.toEqual('');
+  });
+
+  test('data-ga attribute', async ({ page }) => {
+    pageRequestListened(page);
+
+    // TODO
+  });
+});