lovecoding
/
W250913


			
				
					
						
						
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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>hello world</li>
    </ul>
    <button>add</button>
    <script>
        var oBtn = document.getElementsByTagName("button")[0];
        var oUl = document.getElementsByTagName("ul")[0];
        var oLi = document.getElementsByTagName("li")[0];
        oBtn.onclick = function(){
            var newLi = document.createElement("li");
            oUl.append(newLi);
        }
        oUl.onclick = function(evnet){
            // console.log(evnet)
            // event.target 基于事件冒泡 可以捕捉到具体内部哪一个元素触发的事件
            // 事件委托 将内部元素的事件委托给父元素进行处理
            console.log(evnet.target);
        }
        oLi.onclick = function(event){
            console.log("li")
        }
    </script>
</body>
</html>