tryjsref_cos2 在线代码实例

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运行代码

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<p id="demo">单击按钮显示PI和2*PI的余弦值。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
    var a=Math.cos(Math.PI);
    var b=Math.cos(2*Math.PI);
    document.getElementById("demo").innerHTML=a + "<br>" + b;
}
</script>
</body>
</html>
 
 
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运行结果
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