Arry构造器（将所有数组都改为大写）

Array.prototype.myUcase=function()
{
    for (i=0;i<this.length;i++)
    {
        this[i]=this[i].toUpperCase();
    }
}

function myFunction()
{
    var fruits = ["Banaxczxczxczxczxcna", "Orange", "Apple", "Mango"];
    fruits.myUcase();
    var x=document.getElementById("demo");
    x.innerHTML=fruits;
}