源代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Wfuyu教程(wfuyu.com)</title> </head> <body> <p id="demo">单击按钮创建一个数组,调用ucase（）方法, 并显示结果。</p> <button onclick="myFunction()">点我</button> <script> Array.prototype.myUcase=function(){ for (i=0;i<this.length;i++){ this[i]=this[i].toUpperCase(); } } function myFunction(){ var fruits = ["Banana", "Orange", "Apple", "Mango"]; fruits.myUcase(); var x=document.getElementById("demo"); x.innerHTML=fruits; } </script> </body> </html>
运行结果：