数组长度未定义 [英] Array length undefined

问题描述

我正在尝试获取多维数组的长度，如下所示，但是当我用alert()测试它时，我却不确定.我想知道有多少项具有父数组(myArray)，因为我想在循环i=0;i<myArray.length;i++中使用它.

I'm trying to get the length of a multidimensional Array as follows, but when I test it with alert() I get undefined. I would like to know how many items has the parent array (myArray), as I would like then to use it in a cycle i=0;i<myArray.length;i++.

有什么想法吗?

myArray = array = {
        'def':array = {
            "first":"value",
        },
        0 : array = {
            "T":"Some text",
        },
        1 : array = {
            "T":"Some text",
        },
};

leng = myArray.length;
alert(leng);

推荐答案

您可以使用数组语法创建数组:

You can create an array using array syntax:

    array = ["first item", {second:'item'}, 3];
    array.def = {something:"else"};
    alert(array.length);

以下是使用数组数组创建多维数组的方法:

And here's how you create a multidimensional array using an array of arrays:

    array = [
        [1,2,3],
        [4,5,6],
        [7,8,9]
    ];

    alert(array[0][2]); // alerts "3"

这篇关于数组长度未定义的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！