节流:
1.
var throttle = function(fn,delay){
var pre = Date.now();
return function(){
var __me = this;
var args = arguments;
var now = Date.now();
if(now - pre >= delay){
fn.apply(__me,args);
pre = Date.now();
}
}
}
var count = 0;
window.onresize = throttle(function(){
console.log(count++)
},1000)