tryjsref_setutcfullyear3 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">单击按钮来显示六个月前的日期。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
    var d = new Date();
    d.setUTCFullYear(d.getUTCFullYear(),d.getUTCMonth()-6);
    var x = document.getElementById("demo");
    x.innerHTML=d;
}
</script>
</body>
</html>
 
 
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运行结果
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