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Warning: -file- is being assigned a //# sourceMappingURL, but already has one - JavaScript

Warning: -file- is being assigned a //# sourceMappingURL, but already has one

当给定的 JavaScript 源文件被指定了多次源码映射时,JavaScript 会发出“-file- is being assigned a //# sourceMappingURL, but already has one.”警告。

错误信息
Warning: -file- is being assigned a //# sourceMappingURL, but already has one.
错误类型

警告。JavaScript 的执行不会中止。

什么地方出错了?

对于给定的 JavaScript 源码,源码映射规定了不止一次。

JavaScript 源码通常被组合和压缩,使其从服务器传递更加高效。使用源码映射,调试器能够将执行的源码映射到原始的源码。有两种指派源码映射的方式,通过注释,或者对 JavaScript 设置标头。

示例 设置源码映射

使用文件中的注释来设置源码映射:

//# sourceMappingURL=http://example.com/path/to/your/sourcemap.map

或者,你可以对你的 JavaScript 文件设置标头:

X-SourceMap: /path/to/file.js.map
参见

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