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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>安科教程(www.ancii.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>
运行结果
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