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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>文档标题</title>
</head>
<body>
<p type="button" id="demo" onclick="myFunction()" >来改变我呀</p>
</body>
</html>
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function myFunction(){
var
x=7
y=6;
z=(x+y)*y;
document.getElementById("demo").innerHTML= z
}
输入 CSS 代码……