var myarr=new Array(3);//先声明一维数组
document.write("数组的值为：")
for(var i=0;i<myarr.length;i++)
  {
      myarr[i]=new Array(6);/*再申明二维数组*/
      for(var j=0;j<myarr[i].length;j++)
      {
          myarr[i][j]=i*j;
          document.write(" "+myarr[i][j])
      }
      document.write("\n");
  }