29 lines
797 B
Markdown
29 lines
797 B
Markdown
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---
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title: Access Multi-Dimensional Arrays With Indexes
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localeTitle: 访问带索引的多维数组
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---
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## 访问带索引的多维数组
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考虑以下多维数组：
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```javascript
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var arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]];
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```
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这是表格形式的样子。
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|职位| 0 | 1 | 2 | 3 | | --- | --- | --- | --- | --- | | **0** | 1 | 4 | 7 | 10 | | **1** | 2 | 5 | 8 | 11 | | **2** | 3 | 6 | 9 | 12 |
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现在你需要做的就是选择你想要的数据的坐标！例如，如果我们想让`myNum`等于8，那么......
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```javascript
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var myNum = arr[2][1]; // Equal to 8
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```
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或者，如果你想要它等于1.你做...
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```javascript
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var myNum = arr[0][0]; // Equal to 1
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```
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首先，您可以选择该数字所在的列，然后选择该行。它有点像xy坐标平面！
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