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这个是优化之前项目打包后dist目录文件大小,约为20.6M
打包后里面的js文件
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打包后每个js文件都有一个map文件
map文件的作用:项目打包后,代码都是经过压缩加密的,如果运行时报错,输出的错误信息无法准确得知是哪里的代码报错。
有了map就可以像未加密的代码一样,准确的输出是哪一行哪一列有错。
productionSourceMap: 改成false后
优化后,打包目录大小
优化后打包目录里的前端文件
productionSourceMap: 改成false后
所有打包生成的map文件都没有了,打包包体积大小直接从20.6MB变成5.05MB,一下子减少15MB!!!奥利给
总结:
在设置了vue.config.js之后,就不会生成map文件,map文件的作用在于:项目打包后,代码都是经过压缩加密的,如果运行时报错,输出的错误信息无法准确得知是哪里的代码报错。也就是说map文件相当于是查看源码的一个东西。如果不需要定位问题,并且不想被看到源码,就把productionSourceMap
置为false,既可以减少包大小,也可以加密源码。