lovecoding
/
VIPJAVA


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>事件</title>
</head>
<body>
    <button id="btn1" onclick="fun1('1')" >按钮1</button>
    <button id="btn2" >按钮2</button>
    <script>
        function fun1(a){
            alert("fun1执行"+a)
        }

        //方式2  动态
        let btn2 = document.getElementById("btn2");

        btn2.onclick = function (){
            //执行
            alert("fun2执行");
        };

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