数组对象的简单操作

1.数组对象的创建
2.获取数组的长度
3.数组的两种遍历方式
4.数组排序、倒序
5.数组转字符串
6.数组链接

var arr=new Array();
var arr2=new Array(3);
arr[0]="jack";
arr[1]="marry";
arr[2]="tom";
arr[3]="lucy";
arr[4]="june";

arr2[0]=2;
arr2[1]=1;
arr2[2]=5;

for(var i=0;i<arr.length;i++){
    document.write(arr[i]+"<br/>");
}
document.write("<hr/>");
var o;
for(o in arr2){
    document.write(o+" "+arr2[o]+"<br/>");
}
document.write("<hr/>");
document.write("sort()"+arr.sort()+"<br/>");
document.write("sort()"+arr2.sort()+"<br/>");
document.write("<hr/>");
document.write("join()"+arr.join()+"<br/>");
document.write("join()"+arr2.join(".")+"<br/>");
document.write("<hr/>");
document.write("concat()"+arr.concat(arr2)+"<br/>");
document.write("<hr/>");
document.write("reverse()"+arr.reverse()+"<br/>");