There are multiple modules with names that only differ in casing.

This can lead to unexpected behavior when compiling on a filesystem with other case-semantic. Use equal casing. Compare these module identifiers:

运行npm run dev进行

vue编译的时候有警告

E:/project/ys_front/~/_vue-loader@10.3.0@vue-loader/lib/component-normalizer.js

There are multiple modules with names that only differ in casing.

This can lead to unexpected behavior when compiling on a filesystem with other case-semantic. Use equal casing. Compare these module identifiers:

• E:\project\ys_front\node_modules_vue-loader@10.3.0@vue-loader\lib\component-normalizer.js Used by 46 module(s), i. e.

  E:\project\ys_front\node_modules_vux-loader@1.1.2@vux-loader\src\index.js!E:\project\ys_front\node_modules_vue-loader@10.3.0@vue-loader\index.js??ref--0-1!E:\project\ys_front\node_modules_vux@2.5.3@vux\src\components\toast\index.vue

• e:\project\ys_front\node_modules_vue-loader@10.3.0@vue-loader\lib\component-normalizer.js Used by 47 module(s), i. e.

  E:\project\ys_front\node_modules_vux-loader@1.1.2@vux-loader\src\index.js!E:\project\ys_front\node_modules_vue-loader@10.3.0@vue-loader\index.js??ref--0-1!e:\project\ys_front\src\App.vue

E:/project/ys_front/~/_vue-style-loader@2.0.5@vue-style-loader/lib/addStylesClient.js

问题原因：

windows下盘符的大小写导致的。

我在cmd里运行的时候，是切换到小写,改成大写的E盘符就没问题了。