函数防抖实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .show{
            width: 100px;
            height: 100px;
            border: 1px solid green;
            display: block;
        }
        
    </style>
</head>
<body>
    <input id="ipt" type="text">
    <div></div>
</body>
<script>
    var ipt = document.querySelector('#ipt');
    var divs = document.querySelector('div')
    var debounce = function(fn,interval){
        var _self = fn,
            timer = null
        return function(){
            var _me = this,
                args = arguments;
            if(timer){
                clearTimeout(timer)
            }
            timer = setTimeout(function(){
                _self.apply(_me,args)
            },interval || 500)
        }
    }
    ipt.addEventListener('input',debounce(function(e){
        console.log(e.target.value)
        divs.innerHTML = e.target.value
    },500))

    ipt.addEventListener('focus',function(){
        divs.classList.add('show')
        
    })
    ipt.addEventListener('blur',function(){
        divs.classList.remove('show')
    })
</script>
</html>
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