<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.box{
background-color:red;
width: 100px;
height: 100px;
margin-top: 35px;
}
</style>
</head>
<body>
<div class="box" >
</div>
<script>
var box=document.getElementsByClassName("box")[0];
box.onclick=function() {
box.style.backgroundColor = "blue";
}
</script>
</body>
</html>
两边的backgroundcolor 关键字名字不同
body style 里的写法
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div style="width: 100px; height: 100px;background-color:pink;"></div>
<script>
var div= document.getElementsByTagName("div")[0];
div.onmouseover=function(){
div.style.width="200px";
div.style.height="200px";
div.style.backgroundColor="black";
div.style.opacity="0.2";
div.style.filter="alpha(opacity=20)";
}
</script>
</body>
</html>
时间： 2024-08-10 02:10:49