<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>title</title>
</head>
<body>
<input type="button" value="小苏" id="btn"/>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>title</title>
</head>
<body>
<input type="button" value="小苏" id="btn"/>
<script>
//为同一个元素绑定多个不同的事件,指向相同的事件处理函数
document.getElementById("btn").onclick = f1;
document.getElementById("btn").onmouseover = f1;
document.getElementById("btn").onmouseout = f1;
function f1(e){
switch(e.type){
case "click":alert("1111");break;
case "mouseover":this.style.backgroundColor = "red";break;
case "mouseout":this.style.backgroundColor = "green";break;
}
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}
document.getElementById("btn").onmouseover = function(e){
console.log(e);
}
</script>
</body>
</html>