lovecoding
/
W250511


			
				
					
						
						
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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>
</head>
<body>
    <div id="box">
        <span>a</span>
        <span>b</span>
        <span>c</span>
    </div>
    <script>
        // var aSpan = document.getElementsByTagName("span");
        // for(var i=0;i<aSpan.length;i++){
        //     aSpan[i].onclick = function(){
        //         console.log(this.innerText);
        //     }
        // }
        // 事件委托
        // 事件委托的原理：利用事件冒泡的机制，将事件处理函数绑定在父元素上，当子元素触发事件时，会冒泡到父元素上，从而触发事件处理函数
        var oBox = document.getElementById("box");
        oBox.onclick = function(e){
            // console.log(this.innerText)
            console.log(e.target.innerText)

        }
    </script>
</body>
</html>