lovecoding
/
web0331


			
				
					
						
						
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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>
    <ul>
        <li>11</li>
        <li>22</li>
        <li>33</li>
        <li>44</li>
        <p>87878</p>
        <li>55</li>
    </ul>
    <button>添加</button>
    <script>
        var btn = document.querySelector("button")
        var uls = document.querySelector("ul");
        var list  = document.querySelectorAll("ul li");
        // 事件委托：减少内存消耗 避免多次循环
        // for(var i=0;i<list.length;i++) {
        //     list[i].onclick = function(){
        //         console.log(this)
        //     }
        // }
        uls.onclick = function(event) {
            if(event.target.nodeName == 'LI') {

                console.log(event.target.innerText,'www')
            }
        }
        btn.onclick = function() {
            var li1 = document.createElement("li");
            li1.innerText = '大家好';
            uls.appendChild(li1)
        }
    </script>
</body>
</html>