计算使用的数组数量

Question

我有以下内容：

var nr_0 = new Array("","","");
var nr_1 = new Array("","","");
var nr_2 = new Array("","","");
var nr_3 = new Array("","","");
var nr_4 = new Array("","","");

等等...

有没有办法计算使用了多少数组。所以在这种情况下，它应该输出一个数字为 5

的字符串

谢谢。

Answer 1

将它们保存到 1 个数组而不是多个变量中：

var nr = [
    new Array("","",""),
    new Array("","",""),
    new Array("","",""),
    new Array("","",""),
    new Array("","","")
];
console.log(nr.length);

顺便说一句，这个更优雅：

var nr = [
    ["", "", ""],
    ["", "", ""],
    ["", "", ""],
    ["", "", ""],
    ["", "", ""]
];
console.log(nr.length);

计算使用的数组数量

Count the number of arrays that are used

javascript

arrays

count