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throttle.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script type="text/javascript">
function getDateTime(){
return new Date().getTime();
}
//leading trailing 两者不能共存，否则函数不能执行
function throttle(fn, wait, options={
leading: false,
trailing: true
}){
var args, context, result;
var timer=null;
var previous=0;
var later=function(){
previous=options.leading?getDateTime():0;
timer=null;
result=fn.apply(context, args);
if(!timer) args=context=null;
}
return function(){
var nowTime=getDateTime();
if(!previous&&!options.leading) previous=nowTime;
var remaning=wait*1000-(nowTime-previous);//
context=this;
args=[...arguments];
if(remaning<=0||remaning>wait){ //过了设定时间 正常操作
if(timer){
clearTimeout(timer);
timer=null
}
result=fn.apply(this, args);
if(!timer) context=args=null;
}else if(timer&&options.trailing){
timer=setTimeout(later, remaning)
}
return result;
}
}
</script>
</body>
</html>