JS 二维数据的定义

1. Varaa=newArray();//定义一维数组
2. for(i=1;i<=10;i++)
3. {
4. aa[i]=newArray();//将每一个子元素又定义为数组
5. for(n=0;n<=10;n++)
6. {
7. aa[i][n]=i+n;//此时aa[i][n]可以看作是一个二级数组
8. }
9. }

var company=new Array(new Array(),new Array());

一开始new Array()，空的，然后用
company[0][0] = "a1";
company[0][1] = "a2";
来添加数据
那么你再用company[0].length想得到改变后的长度，是得不到的。

往Array对象添加/删除元素：
<SCRIPT LANGUAGE="JavaScript1.2">

myFish = ["angel", "clown", "mandarin", "surgeon"];
document.writeln("myFish: " + myFish + "<BR>");

removed = myFish.splice(2, 0, "drum");
document.writeln("After adding 1: " + myFish);
document.writeln("removed is: " + removed + "<BR>");

removed = myFish.splice(3, 1)
document.writeln("After removing 1: " + myFish);
document.writeln("removed is: " + removed + "<BR>");

removed = myFish.splice(2, 1, "trumpet")
document.writeln("After replacing 1: " + myFish);
document.writeln("removed is: " + removed + "<BR>");

removed = myFish.splice(0, 2, "parrot", "anemone", "blue")
document.writeln("After replacing 2: " + myFish);
document.writeln("removed is: " + removed);

</SCRIPT>

This script displays:

myFish: ["angel", "clown", "mandarin", "surgeon"]

After adding 1: ["angel", "clown", "drum", "mandarin", "surgeon"]
removed is: undefined

After removing 1: ["angel", "clown", "drum", "surgeon"]
removed is: mandarin

After replacing 1: ["angel", "clown", "trumpet", "surgeon"]
removed is: drum

After replacing 2: ["parrot", "anemone", "blue", "trumpet", "surgeon"]
removed is: ["angel", "clown"]