push() 一个二维数组 [英] push() a two-dimensional array

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本文介绍了push() 一个二维数组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在尝试推送到一个二维数组而不会弄乱,目前我的数组是:

I'm trying to push to a two-dimensional array without it messing up, currently My array is:

var myArray = [
[1,1,1,1,1],
[1,1,1,1,1],
[1,1,1,1,1]
]

我正在尝试的代码是:

var r = 3; //start from rows 3
var c = 5; //start from col 5

var rows = 8;
var cols = 7;

for (var i = r; i < rows; i++)
{
    for (var j = c; j < cols; j++)
    {
        myArray[i][j].push(0);
    }
}

结果如下:

var myArray = [
[1,1,1,1,1,0,0],
[1,1,1,1,1,0,0],
[1,1,1,1,1,0,0],
[0,0,0,0,0,0,0],
[0,0,0,0,0,0,0],
[0,0,0,0,0,0,0],
]

但它并不确定这是否是正确的方法.

But it doesn't and not sure whether this is the correct way to do it or not.

那么问题是我将如何实现这一点?

So the question is how would I accomplish this?

推荐答案

您的代码中有一些错误:

You have some errors in your code:

  1. 使用 myArray[i].push( 0 ); 添加新列.您的代码 (myArray[i][j].push(0);) 将在 3 维数组中工作,因为它会尝试将另一个元素添加到位于 [i] 位置的数组中[j].
  2. 您只在所有行中扩展 (col-d)-许多列,即使在那些尚未初始化并因此到目前为止没有条目的列中也是如此.
  1. Use myArray[i].push( 0 ); to add a new column. Your code (myArray[i][j].push(0);) would work in a 3-dimensional array as it tries to add another element to an array at position [i][j].
  2. You only expand (col-d)-many columns in all rows, even in those, which haven't been initialized yet and thus have no entries so far.

一个正确的,虽然有点冗长的版本,如下:

One correct, although kind of verbose version, would be the following:

var r = 3; //start from rows 3

var rows = 8;
var cols = 7;

// expand to have the correct amount or rows
for( var i=r; i<rows; i++ ) {
  myArray.push( [] );
}

// expand all rows to have the correct amount of cols
for (var i = 0; i < rows; i++)
{
    for (var j =  myArray[i].length; j < cols; j++)
    {
        myArray[i].push(0);
    }
}

这篇关于push() 一个二维数组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!

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