如何在javascript中将值分配给多维数组? [英] how to assign values to multidimensional arrays in javascript?

问题描述

我尝试通过以下方式做到这一点:

I tried to do this with:

arr[i][j] = 'whatever';

但是我遇到某种错误无法转换为对象..."

but I get some kind of error "cannot convert to object..."

推荐答案

当您尝试将其视为数组时，我想您还没有初始化a[i].如果您在说a[i][j]时没有将a[i]初始化为数组，那么它将是未定义的(或者其他不是数组或对象的东西)，并且不知道[j]是什么意思，因此，您的无法转换为对象"错误.您需要更多类似这样的东西:

I'm going to guess that you haven't initialized a[i] when you try to treat it like an array. If you haven't initialized a[i] to be an array when you say a[i][j], then it will be undefined (or something else that isn't an array or object) and that doesn't know what [j] means, hence your "cannot convert to an object" error. You need something more like this:

var a = [ ];
for(var i = 0; i < 10; ++i) {
    a[i] = [ ];
    for(var j = 0; j < 10; ++j) {
        a[i][j] = 42; // a[i] is now an array so this works.
    }
}

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