var array = new Array(["no1","no2"]);
array["po"] = "props1";
alert(array[0][0]);
alert(array.length); //2
//对于数组来说,array[0]同array["0"]效果是一样的(?不确定,测试时如此)
alert(array[0] + "_" + array["1"] + "_" + array.po);//