代碼部分:
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
div{
width: 100%;
height: 100px;
background: black;
margin: 10px auto;
transition: all 0.3s;
}
/*改變之後的樣式*/
.change{
width: 600px;
background: orange;
}
</style>
<script type="text/javascript">
window.οnlοad=function(){
var box=document.getElementsByTagName('div');
var b=document.getElementsByTagName("button")[0];
b.οnclick=function(){
for(var i=0;i<box.length;i++){
if(box[i].className==" "){
box[i].className="change";
}else{
box[i].className=" ";
}
}
};
}
</script>
</head>
<body>
<div></div>
<div></div>
<div></div>
<button>點擊改變樣式</button>
</body>
</html>
