你如何轻松创建空矩阵javascript？ [英] How do you easily create empty matrices javascript?

问题描述

在python中，你可以这样做：

In python, you can do this:

[([None] * 9) for x in range(9)]

你会得到这个：

[[None, None, None, None, None, None, None, None, None],
 [None, None, None, None, None, None, None, None, None],
 [None, None, None, None, None, None, None, None, None],
 [None, None, None, None, None, None, None, None, None],
 [None, None, None, None, None, None, None, None, None],
 [None, None, None, None, None, None, None, None, None],
 [None, None, None, None, None, None, None, None, None],
 [None, None, None, None, None, None, None, None, None],
 [None, None, None, None, None, None, None, None, None]]

如何在javascript中执行等效操作？

How can I do the equivalent in javascript?

推荐答案

var matrix = [];
for(var i=0; i<9; i++) {
    matrix[i] = new Array(9);
}

...或者：

var matrix = [];
for(var i=0; i<9; i++) {
    matrix[i] = [];
    for(var j=0; j<9; j++) {
        matrix[i][j] = undefined;
    }
}

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