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什么是源代码映射?

什么是源代码映射?
源映射的必要性

早期的 Web 应用的复杂性较低。开发者直接将 HTML、CSS 和 JavaScript 文件部署到 Web 上。

在开发工作流中,更现代、更复杂的 Web 应用可能需要使用各种工具。例如:

1.模板语言和 HTML 预处理器:Pug、Nunjucks、Markdown。2.CSS 预处理器:SCSS、LESS、PostCSS。3.JavaScript 框架:Angular、React、Vue、Svelte。4.JavaScript 元框架:Next.js、Nuxt、Astro。5.高级编程语言:TypeScript、Dart、CoffeeScript。

这些工具需要构建流程来将您的代码转译为浏览器可以理解的标准 HTML、JavaScript 和 CSS。常见做法还包括使用 Terser[1] 等工具缩减和合并这些文件,以优化性能。

例如,使用构建工具,我们可以将以下 TypeScript 文件转译并压缩为一行 JavaScript。

/* A TypeScript demo: example.ts */document.querySelector('button')?.addEventListener('click'() => {  const numnumber = Math.floor(Math.random() * 101);  const greetstring = 'Hello';  (document.querySelector('p'as HTMLParagraphElement).innerText = `${greet}, you are no. ${num}!`;  console.log(num);});

压缩后的版本将如下所示:

/* A compressed JavaScript version of the TypeScript demo: example.min.js  */document.querySelector("button")?.addEventListener("click",(()=>{const e=Math.floor(101*Math.random());document.querySelector("p").innerText=`Hello, you are no. ${e}!`,console.log(e)}));

不过,压缩代码可能会使调试变得更加困难。源映射可以解决此问题:通过将编译后的代码映射回原始代码,源映射可以帮助您快速找到错误的来源。

生成源映射

源映射是名称以 .map 结尾的文件(例如 example.min.js.map 和 styles.css.map)。大多数构建工具(包括 Vite、webpack、Rollup、Parcel 和 esbuild)都可以生成源映射。

某些工具默认包含源代码映射。其他工具可能需要进行额外的配置才能生成:

/* Example configuration: vite.config.js *//* https://vitejs.dev/config/ */export default defineConfig({  build: {    sourcemaptrue// enable production source maps  },  css: {    devSourcemaptrue // enable CSS source maps during development  }})

了解源映射

为了帮助调试,这些源映射文件包含有关编译代码如何映射到原始代码的重要信息。以下是源映射示例:

{  "mappings""AAAAA,SAASC,cAAc,WAAWC, ...",  "sources": ["src/script.ts"],  "sourcesContent": ["document.querySelector('button')..."],  "names": ["document","querySelector", ...],  "version"3,  "file""example.min.js.map"}

如需了解其中每个字段,您可以参阅源代码映射规范[2]

源映射最重要的部分是 mappings 字段。它使用 VLQ base 64 编码字符串[3]将编译文件中的行和位置映射到相应的原始文件。您可以使用源代码映射可视化工具(例如 source-map-visualization[4] 或 Source Map Visualization)查看此映射。

左侧的生成列显示压缩内容,原始列显示原始来源。

可视化工具会为 original 列中的每行分配颜色代码,并在 generated 列中显示相应的代码。

映射部分会显示代码的已解码映射。例如,条目 65 -> 2:2 表示:

1.生成的代码:const 一词位于压缩内容的 65 位。2.原始代码:const 一词位于原始内容的第 2 行和第 2 列。

这样,开发者就可以快速确定经过缩减的代码与原始代码之间的关系,从而使调试过程更加顺畅。

浏览器开发者工具会应用这些源代码映射,以帮助您在浏览器中快速查明调试问题。

References

[1] Terser: https://github.com/terser/terser[2] 源代码映射规范: https://bit.ly/sourcemap[3] VLQ base 64 编码字符串: https://developer.chrome.com/blog/sourcemaps?hl=zh-cn#base64-vlq-and-keeping-the-source-map-small[4] source-map-visualization: https://sokra.github.io/source-map-visualization/


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  1. 请求信息 : 2026-05-09 11:17:19 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/591184.html
  2. 运行时间 : 0.268713s [ 吞吐率:3.72req/s ] 内存消耗:4,973.78kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=551aa2e1db7c16aefab6b702de131767
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  1. CONNECT:[ UseTime:0.000896s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001346s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000672s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000613s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001335s ]
  6. SELECT * FROM `set` [ RunTime:0.000540s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001435s ]
  8. SELECT * FROM `article` WHERE `id` = 591184 LIMIT 1 [ RunTime:0.017142s ]
  9. UPDATE `article` SET `lasttime` = 1778296639 WHERE `id` = 591184 [ RunTime:0.024655s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.004173s ]
  11. SELECT * FROM `article` WHERE `id` < 591184 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.017921s ]
  12. SELECT * FROM `article` WHERE `id` > 591184 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006447s ]
  13. SELECT * FROM `article` WHERE `id` < 591184 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007811s ]
  14. SELECT * FROM `article` WHERE `id` < 591184 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002351s ]
  15. SELECT * FROM `article` WHERE `id` < 591184 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009150s ]
0.270469s