javascript - 将值添加到另一个数组中的数组

Question

假设我有一个像这样的数组:

var someData = [ // count: 5

    [ something, something, something ], // count: 3
    [ something ], // count: 1
    [ something, something, something, something ],  // count: 4
    [ ], // count: 0
    [ something, something ] // count: 2
]; 

我需要像这样制作数组:

var myArray = [];

var firstCount = someData.lenght; // count: 5

for( a = 0; a < firstCount; a++ ) {

    allObjects[a] = firstObject;


    var secondCount = someData[a].lenght; // each has different

    for( b = 0; b < secondCount; b++ ) {

        allObjects[a] = secondObject; 
    }
}

<小时/>

我期望它是怎样的:

allObjects = [

    [ firstObject, secondObject, secondObject ], // count: 3
    [ firstObject ], // count: 1
    [ firstObject, secondObject, secondObject, secondObject ], // count:  4
    [ ], // count: 0
    [ firstObject, secondObject ], // count: 2
];

<小时/>

在这个例子中我可能犯了一些(格式)错误，但我希望我的目标很明确 - 我需要将对象推送到已经在数组中的对象数组 但它似乎替换了该值，而不是向其中添加新值。

我在这里缺少什么？

Answer 1

我可能是错的，但从您的预期结果来看，您似乎想将其推送到数组的第二个索引。在这种情况下，您可以将内部 for 循环更改为

var secondCount = someData[a].lenght; // each has different

    for( b = 1; b < secondCount; b++ ) {

        allObjects[a][b] = secondObject; 
    }

注意 b = 1 和 allObjects[a][b] 的变化