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：[Android][0.24.1][Windows] packager not update when change js file content #7257