Front-End-Knowledge/settimeout.html at master · avrinfly/Front-End-Knowledge · GitHub

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<!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>
        #box{
            width: 200px;
            height: 200px;
            background: #ccc;
            color: #fff;
            text-align: center;
            line-height: 200px;
        }
    </style>
</head>
<body>
    <div id="box"></div>
    <script>
        // var count = 0
        // var box = document.getElementById('box')
        // function getAdd(e){
        //     console.log(box)
        //     box.innerHTML = count++
        // }
        // box.onmousemove = getAdd
        let Observe = new MutationObserver(function(mutations){
            console.log(mutations+'s')
        })
    </script>
</body>
</html>