Question

我尝试创建三维数组并为其赋值，根据答案creating and parsing a 3D array in javascript?。

var myArr = new Array(new Array(new Array()));

myArr[0][0][0] = "1";
myArr[0][0][1] = "2";
myArr[0][1][0] = "2";
myArr[0][1][1] = "2";
myArr[0][2][0] = "3";
myArr[0][2][1] = "4";

但我得到了这个

Uncaught Typeerror：无法设置未定义的“0”属性。

需要一些帮助。

谢谢

Answer 1

javascript中没有预先启动变量，编译步骤只是提升顶级变量和函数定义，而在ES6中，静态导入和导出（尽管尚未支持）[Patrick Roberts]。另外一个选择是

var myArr = new Array();
myArr[0] = new Array();
myArr[0][0] = new Array();
myArr[0][0][0] = "1";
myArr[0][0][1] = "2";
myArr[0][1] = new Array();
myArr[0][1][0] = "2";
myArr[0][1][1] = "2";
myArr[0][2] = new Array();
myArr[0][2][0] = "3";
myArr[0][2][1] = "4";

Answer 2

你可以这样做（但是在javascript中创建3d数组是更完整的东西。请考虑改变处理数据的方法）：

var myArr = new Array();
myArr[0] = new Array();
myArr[0][0] = new Array();
myArr[0][0][0] = "1";
myArr[0][0][1] = "2";
myArr[0][1] = new Array();
myArr[0][1][0] = "2";
myArr[0][1][1] = "2";
myArr[0][2] = new Array();
myArr[0][2][0] = "3";
myArr[0][2][1] = "4";

console.log(myArr[0][2][0]);

创建三维数组并在Javascript中为其赋值

2 个答案: