嗨，我如何使用Javascript引用锯齿状阵列中的元素 [英] Hi, How Do I Refer To An Element In Jagged Array Using Javascript

问题描述

var arr = {1：[23,34,45]，2：[14,22,42]，3：[55,66,77]};

我如何推荐使用javascript在上面声明的锯齿状数组中42？

var arr={1:[23,34,45], 2:[14, 22, 42], 3:[55, 66,77]};
how do i refer to "42" in the above declared jagged array using javascript??

推荐答案

这不是锯齿状数组。它的一个对象 [ ^ ]，其中1,2和3为键，数组为值。 />


你可以用这种方式访问​​ 42 ：

That's not a jagged array. It's an Object[^] with 1, 2 and 3 as keys and arrays as values.

You can use this way to access 42:

arr[2][2]

arr [2] 指的是数组 [14,22,42] （你给了钥匙 2 ），最后一个 [2] 获取数组中的第三个元素，即42。

arr[2] refers to the array [14, 22, 42] (which you gave the key 2), and the last [2] takes the third element from the array, which is 42.

你有解决方案1，但我认为你缺乏对JavaScript对象如何工作的理解。重要的是要理解它们都是关联数组。请参阅：

http://en.wikipedia.org/wiki/Associative_array [< a href =http://en.wikipedia.org/wiki/Associative_arraytarget =_ blanktitle =New Window> ^ ]，

http://en.wikipedia.org/wiki/JavaScript#Dynamic [ ^ ]。



有什么区别？ />

You got Solution 1, but I think you lack the understanding how JavaScript objects work. It's important to understand that they all are associative arrays. Please see:
http://en.wikipedia.org/wiki/Associative_array[^],
http://en.wikipedia.org/wiki/JavaScript#Dynamic[^].

What is the difference between

var someArray = [11, 12, 13];

和

and

var someObject = {0:11; 1:12: 2:13 }; //?

只有一个：someArray拥有属性长度：

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array [ ^ ]，

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects [ ^ ]。



其他一切都是一样的;您通过索引访问该属性：

Only one: someArray have the property length:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array[^],
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects[^].

Everything else is the same; you access the property through index:

var first = someObject[0]; // 11

另请参阅：

https：/ /developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object [ ^ ]，

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects [ ^ ]，

< a href =https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_Object-Oriented_JavaScript> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_Object -Oriented_JavaScrip t [ ^ ]。

-SA

See also:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object[^],
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects[^],
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_Object-Oriented_JavaScript[^].

—SA

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