xxxxxxxxxx<html><head><meta charset="utf-8"><title>W3Cschool教程(w3cschool.cn)</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>