在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(cainiaoplay.com)</title>
</head>
<body>

<p id="demo">单击按钮来调用新的myMet()方法,并显示这个月的月份，,使用新的myProp方法</p>
<button onclick="myFunction()">点我</button>
<script>
Date.prototype.myMet=function(){
	if (this.getMonth()==0){this.myProp="一月"};
	if (this.getMonth()==1){this.myProp="二月"};
	if (this.getMonth()==2){this.myProp="三月"};
	if (this.getMonth()==3){this.myProp="四月"};
	if (this.getMonth()==4){this.myProp="五月"};
	if (this.getMonth()==5){this.myProp="六月"};
	if (this.getMonth()==6){this.myProp="七月"};
	if (this.getMonth()==7){this.myProp="八月"};
	if (this.getMonth()==8){this.myProp="九月"};
	if (this.getMonth()==9){this.myProp="十月"};
	if (this.getMonth()==10){this.myProp="十一月"};
	if (this.getMonth()==11){this.myProp="十二月"};
}
function myFunction(){
	var d = new Date();
	d.myMet();
	var x=document.getElementById("demo");
	x.innerHTML=d.myProp;
}
</script>

</body>
</html>
源代码

动行结果
