0xTYLER

Use `forEach` instead of `map` is more semantic.

webpack 4 + Babel 7 + dva 使用hmr无效

3

### `.babelrc`配置如下 ``` { "presets": [ [ "@babel/preset-env", { "modules": "cjs", "useBuiltIns": "usage", "corejs": 3, "targets": { "ie": 11 } } ], "@babel/preset-react" ], "plugins": [ [ "dva-hmr" ], [...