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<!DOCTYPE html>
<html>
<head>
<title>HTML文档(Dom)改变css样式</title>
<style type="text/css">
#box{width: 100px; height: 100px; background: #ccc; }
</style>
</head>
<body>
<!-- 改变css样式 -->
<!-- 语法 document.getElementById().style.属性名='属性值' -->
<div id='box' onclick="myDiv(this)"></div>
<script type="text/javascript">
function myDiv(x){
y=document.getElementById('box')
y.style.background='red'
y.style.borderRadius='50px'
}
</script>
</body>
</html>
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