function conunt(){  console.log(1)}//停止滑动后，定时结束才执行函数处理逻辑function throttle(method,context){  clearTimeout(method.tId)  method.tId = setTimeout(function(){    method.call(context);  },1000)}//滑动的时候，隔一段时间，不管有没停止滑动，都要执行处理逻辑var time = +new Date();function count2(){  console.log("函数调用："+(+new Date() - time));}var throttle2 = function(fn,delay,mustRun){  var timer = null,previous=null;  return function(){    var now = +new Date(),        context= this,        args = arguments;    if(!previous) previous = now;    var remaining  = now - previous;    if(mustRun && remaining >= mustRun){      fn.apply(context,args);      previous = now;    }else{      clearTimeout(timer);      timer = setTimeout(function(){        fn.apply(context,args);      },delay);    }  }}window.onscroll = throttle2(count2,500,1000);window.onscroll = function(){  console.log(0)  throttle(conunt);}