react native reload 没有变化问题

解决的办法就是打开文件 
app_name ode_modules eact-native ode_modules ode-hastelibFileWatcherindex.js 
修改变量MAX_WAIT_TIME：

// var MAX_WAIT_TIME = 120000;
var MAX_WAIT_TIME = 360000;

修改部分代码：

key: '_createWatcher',
    value: function _createWatcher(rootConfig) {
      var watcher = new WatcherClass(rootConfig.dir, {
        glob: rootConfig.globs,
        dot: false
      });

      return new Promise(function (resolve, reject) {

        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('
')));
        }, MAX_WAIT_TIME);

        watcher.once('ready', function () {
          clearTimeout(rejectTimeout);
          resolve(watcher);
        });
      });
    }