急!!!!JS中定义三维变量问题

Question

function s_volumelist()
{
         this.length=12;
         this[0][0]=new Array(2);
                this[0][0][0]=new Option("上册","上册");
                this[0][0][1]=new Option("下册","下册");
         this[0][1]=new Array(2);
                this[0][1][0]=new Option("上册","上册");
                this[0][1][1]=new Option("下册","下册");
         this[0][2]=new Array(2);
                this[0][2][0]=new Option("上册","上册");
                this[0][2][1]=new Option("下册","下册");
         this[0][3]=new Array(2);
                this[0][3][0]=new Option("上册","上册");
                this[0][3][1]=new Option("下册","下册");
         this[0][4]=new Array(2);
                this[0][4][0]=new Option("上册","上册");
                this[0][4][1]=new Option("下册","下册");
         this[0][5]=new Array(2);
                this[0][5][0]=new Option("上册","上册");
                this[0][5][1]=new Option("下册","下册");
         this[1][0]=new Array(2);
                this[1][0][0]=new Option("上册","上册");
                this[1][0][1]=new Option("下册","下册");
         this[1][1]=new Array(2);
                this[1][1][0]=new Option("上册","上册");
                this[1][1][1]=new Option("下册","下册");
         this[1][2]=new Array(2);
                this[1][2][0]=new Option("上册","上册");
                this[1][2][1]=new Option("下册","下册");
         this[1][3]=new Array(2);
                this[1][3][0]=new Option("上册","上册");
                this[1][3][1]=new Option("下册","下册");
         this[1][4]=new Array(2);
                this[1][4][0]=new Option("上册","上册");
                this[1][4][1]=new Option("下册","下册");
         this[1][5]=new Array(2);
                this[1][5][0]=new Option("上册","上册");
                this[1][5][1]=new Option("下册","下册");
         return this;
}s_volumeOP=new s_volumelist();
然后我调用 s_volumeOP告诉未定义,什么原因呢?求大家指个明路!谢谢!

Answer 1

function s_volumelist()
{
var arr = [];
arr[0] = [];
arr[0][0]=new Array(2);
arr[0][0][0]=new Option("上册","上册");
arr[0][0][1]=new Option("下册","下册");
arr[0][1]=new Array(2);
arr[0][1][0]=new Option("上册","上册");
arr[0][1][1]=new Option("下册","下册");
arr[0][2]=new Array(2);
arr[0][2][0]=new Option("上册","上册");
arr[0][2][1]=new Option("下册","下册");
arr[0][3]=new Array(2);
arr[0][3][0]=new Option("上册","上册");
arr[0][3][1]=new Option("下册","下册");
arr[0][4]=new Array(2);
arr[0][4][0]=new Option("上册","上册");
arr[0][4][1]=new Option("下册","下册");
arr[0][5]=new Array(2);
arr[0][5][0]=new Option("上册","上册");
arr[0][5][1]=new Option("下册","下册");
arr[1] = [];
arr[1][0]=new Array(2);
arr[1][0][0]=new Option("上册","上册");
arr[1][0][1]=new Option("下册","下册");
arr[1][1]=new Array(2);
arr[1][1][0]=new Option("上册","上册");
arr[1][1][1]=new Option("下册","下册");
arr[1][2]=new Array(2);
arr[1][2][0]=new Option("上册","上册");
arr[1][2][1]=new Option("下册","下册");
arr[1][3]=new Array(2);
arr[1][3][0]=new Option("上册","上册");
arr[1][3][1]=new Option("下册","下册");
arr[1][4]=new Array(2);
arr[1][4][0]=new Option("上册","上册");
arr[1][4][1]=new Option("下册","下册");
arr[1][5]=new Array(2);
arr[1][5][0]=new Option("上册","上册");
arr[1][5][1]=new Option("下册","下册");
return arr;
}
s_volumeOP=s_volumelist();