iOS下因为有watchman这个插件，所以启动很快（npm start），而Windows下则非常慢，最要命的是遇到了修改js文件后，点击reload居然一直是请求的缓存bundle，泪崩。。。

后来找到一篇文章，解决了这个问题，就是说超时导致的，但是超时的时候没有反馈错误，原因不明。解决方案就是延长超时时间：

 

//\node_modules\node-haste\lib\FileWatcher\index.js // 修改MAX_WAIT_TIME的值为360000 //找到如下代码 key: '_createWatcher',     value: function _createWatcher(rootConfig) {
          var watcher = new WatcherClass(rootConfig.dir, {
            glob: rootConfig.globs,         dot: false       });       return new Promise(function (resolve, reject) {
            var rejectTimeout = setTimeout(function () {
              return reject(new Error(timeoutMessage(WatcherClass)));         }, MAX_WAIT_TIME);         watcher.once('ready', function () {
              clearTimeout(rejectTimeout);           resolve(watcher);         });       });     } //修改为 key: '_createWatcher',     value: function _createWatcher(rootConfig) {
          var watcher = new WatcherClass(rootConfig.dir, {
            glob: rootConfig.globs,         dot: false       });       return new Promise(function (resolve, reject) {
            const rejectTimeout = setTimeout(function() {
              reject(new Error([             'Watcher took too long to load',             'Try running `watchman version` from your terminal',             'https://facebook.github.io/watchman/docs/troubleshooting.html',           ].join('\n')));         }, MAX_WAIT_TIME);         watcher.once('ready', function () {
              clearTimeout(rejectTimeout);           resolve(watcher);         });       });     }

参考文章