函数节流和防抖动

最新推荐文章于 2024-09-22 14:13:05 发布

转载最新推荐文章于 2024-09-22 14:13:05 发布 · 1.4k 阅读

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#js #函数 #节流函数防抖动

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<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <title>赤壁之战</title>
        <meta http-equiv="X-UA-Compatible" content="edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta name="Keywords" content="赤壁之战">
        <meta name="description" content="赤壁之战">
    </head>
<body>
<script>
function throttle(func,wait,mustRun){
    var timeout = null;
    var startTime = new Date();
    return function (){
        var context = this,
        args = arguments,
        curTime = new Date();
        clearTimeout(timeout);
        if(curTime - startTime >= mustRun){
            func.apply(context,args);
            startTime = curTime;
        }else{
            timeout = setTimeout(func,wait);
        }  
    }
}
function fn(){
    console.log(1);
}
function fn2(){
    console.log(2);
}
window.addEventListener('scroll',fn,false); 
window.addEventListener('scroll',throttle(fn2,500,1000),false);
</script>
</body>
</html>

<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <title>赤壁之战</title>
        <meta http-equiv="X-UA-Compatible" content="edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta name="Keywords" content="赤壁之战">
        <meta name="description" content="赤壁之战">
    </head>
<body>
<script>
function debounce(fn,wait){
    var timeout = null;
    return function (){
        clearTimeout(timeout);
        timeout = setTimeout(fn,wait);
    }
}
function debounce2 (fn,wait,immeditate){
    var timeout = null;
    return function (){
        var context = this,
        args = arguments;
        var later = function (){
            timeout = null;
            if(!immeditate) fn.apply(context,args);
        }
        var callNow = immeditate & !timeout;
        clearTimeout(timeout);
        timeout = setTimeout(later,wait);
        if(callNow) func.apply(context,args)
    }
}
function fn(){
    console.log(1);
}

function fn2(){
    console.log(2);
}
window.addEventListener('scroll',fn,false); 
window.addEventListener('scroll',debounce2(fn2,500),false);
</script>  
</body>
</html>