js mouse events onmouseover onmouseenter onmousemove difference

This case may be a clear distinction between the three, there is a need of the code can be copied to a local editor to view and compare results.

<!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>
        div {
            width: 100px;
            height: 100px;
            border: 1px solid black;
            margin: 10px;
            float: left;
            padding: 30px;
            text-align: center;
            background-color: lightgray;
        }
        p {
            background-color: white;
        }
    </style>
</head>
<body>
    <h3>该实例演示了 onmousemove, onmouseenter 和 onmouseover 的不同。</h3> 
    <p> onmousemove 事件在鼠标移动到 div 元素上就开始时触发，在这个div上移动一直触发（冒泡）。</p> 
    <p> mouseenter 事件中有在鼠标指针进入 div 元素时触发（不冒泡）。 </p> 
    <p> onmouseover 事件在鼠标指针进入 div 元素时触发,在子元素上也会触发(p 和 span)（冒泡）。</p> 
    <hr>
    <div onmousemove="myMoveFunction()"> 
    <p>onmousemove: <br> <span id="demo">鼠标移动到我这!</span></p> </div> 
    <div onmouseenter="myEnterFunction()"> <p>onmouseenter: <br> <span id="demo2">标移动到我这!</span></p> </div> 
    <div onmouseover="myOverFunction()"> <p>onmouseover: <br> <span id="demo3">标移动到我这!</span></p> </div> 
</body>
<script>
    var x = 0,y = 0,z = 0;
    
    function myMoveFunction() {
        document.getElementById("demo").innerHTML = z+=1;
    }
    
    function myEnterFunction() {
        document.getElementById("demo2").innerHTML = x+=1;
    }
    
    function myOverFunction() {
        document.getElementById("demo3").innerHTML = y+=1;
    }
</script>
</html>

image.png

Reproduced in: https: //www.jianshu.com/p/ac5ed5e0f901

js mouse events onmouseover onmouseenter onmousemove difference

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