input值变化，延时触发事件

1.debounce去抖动

function debounce(method,delay){
    var timer = null; 
    return function(){
        var context = this,args = arguments;
        clearTimeout(timer); 
        timer = setTimeout(function(){
            method.apply(context,args); 
        },delay);
    }
}

2.throttle节流

function throttle(method, delay, time) {
     var timeout,startTime = +new Date();
     return function() {
         var context = this,
         args = arguments,
         curTime = +new Date();
         clearTimeout(timeout);
         // 如果达到了规定的触发时间间隔，触发 handler
         if (curTime - startTime >= time) {
           method.apply(context, args);
           startTime = curTime;
       } else {
           // 没达到触发间隔，重新设定定时器
           timeout = setTimeout(method, delay);
     }
 };