节流

debounce:

throttle:

还有 batch，上传数据时常用：

function batch(fn) {
  var cache = [], timer;
  return function() {
    cache.put(arguments);
    if(timer) return;
    timer = setTimeout(()=>{
      cache.forEach(args => fn(args));
      timer = null;
      cache.length = 0;
    }, 2000);
  }
}