HTML DOM-->事件流

2.事件流的实现

　　通过true或false来控制

　　举例1：从外向内流：true

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>js_excise</title>    
    </head>

    <body>
        <div id="box1" style="background-color: #00FFFF; 70px;height: 70px;">
            <div id="box2" style="background-color: red; 50px;height: 50px;">
                <div id="box3" style="background-color: yellow; 30px;height: 30px;"></div>
            </div>
        </div>
        <script type="text/javascript">
            var jsBOX1 = document.getElementById('box1')
            var jsBOX2 = document.getElementById('box2')
            var jsBOX3 = document.getElementById('box3')
            jsBOX1.addEventListener('click',function(){
                console.log("jsBOX1")
            },true)
            jsBOX2.addEventListener('click',function(){
                console.log("jsBOX2")
            },true)
            jsBOX3.addEventListener('click',function(){
                console.log("jsBOX3")
            },true)    
        </script>
    </body>
</html>

　　输出：

　　举例2：从内向外流：false

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>js_excise</title>    
    </head>

    <body>
        <div id="box1" style="background-color: #00FFFF; 70px;height: 70px;">
            <div id="box2" style="background-color: red; 50px;height: 50px;">
                <div id="box3" style="background-color: yellow; 30px;height: 30px;"></div>
            </div>
        </div>
        <script type="text/javascript">
            var jsBOX1 = document.getElementById('box1')
            var jsBOX2 = document.getElementById('box2')
            var jsBOX3 = document.getElementById('box3')
            jsBOX1.addEventListener('click',function(){
                console.log("jsBOX1")
            },false)
            jsBOX2.addEventListener('click',function(){
                console.log("jsBOX2")
            },false)
            jsBOX3.addEventListener('click',function(){
                console.log("jsBOX3")
            },false)    
        </script>
    </body>
</html>

　　输出：

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原文地址：https://www.cnblogs.com/abner-pan/p/12817621.html