lovecoding
/
Web1020


			
				
					
						
						
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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">
    <title>Document</title>
    <style>
        .box{
            width: 400px;
            height: 400px;
            background-color: red;
        }
        .box2{
            width: 300px;
            height: 300px;
            background-color: blue;
        }
        .box3{
            width: 200px;
            height: 200px;
            background-color: green;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="box2">
            <div class="box3"></div>
        </div>
    </div>
    <script>
        // onmouseover 与 onmouseenter 区别
        // onmouseover 会出发事件冒泡
        // onmouseenter 不会触发事件冒泡
        // onmouseout 与 onmouseleave 区别
        // onmouseout 会触发事件冒泡
        // onmouseleave 不会触发事件冒泡
        var oBox = document.getElementsByClassName("box")[0];
        var oBox2 = document.getElementsByClassName("box2")[0];
        var oBox3 = document.getElementsByClassName("box3")[0];
        // oBox.onmouseover = function(){
        //     console.log("鼠标移入box1:onmouseover");
        // }
        // oBox2.onmouseover = function(){
        //     console.log("鼠标移入box2:onmouseover");
        // }
        // oBox3.onmouseover = function(){
        //     console.log("鼠标移入box3:onmouseover");
        // }

        oBox.onmouseenter = function(){
            console.log("鼠标移入box1:onmouseenter");
        }
        oBox2.onmouseenter = function(){
            console.log("鼠标移入box2:onmouseenter");
        }
        oBox3.onmouseenter = function(){
            console.log("鼠标移入box3:onmouseenter");
        }

        // oBox.onmouseout = function(){
        //     console.log("鼠标移出:onmouseout");
        // }

        // oBox.onmouseenter = function(){
        //     console.log("鼠标移入:onmouseenter");
        // }
        // oBox.onmouseleave = function(){
        //     console.log("鼠标移出:onmouseleave");
        // }
    </script>
</body>
</html>