用于循环分配键的javascript对象/数组

Question

我有一个看起来像这样的对象:

var obj = {
    "cat" : [
        {val: 'res', string: "Residential & Single Family Homes"},
        {val: 'Dup', string: "Duplexes & Apartments"},
        {val: 'Con', string: "Condominiums"},
        {val: 'Lot', string: "Lots, Land & Farms"},
        {val: 'Com', string: "Commercial"},
        {val: 'Mob', string: "Mobile Homes"},
    ],
    "bdrms" : [
        {val: "1", string: "1 Bedroom"},
        {val: "2", string: "2 Bedrooms"},
        {val: "3", string: "3 Bedrooms"},
        {val: "4", string: "4 Bedrooms"},
        {val: "5", string: "5 Bedrooms"},
    ],
    "bthrms" : [
        {val: "1", string: "1 Bathroom"},
        {val: "1.1", string: "1 1/2 Bathrooms"},
        {val: "2", string: "2 Bathrooms"},
        {val: "2.1", string: "2 1/2 Bathrooms"},
        {val: "3", string: "3 Bathrooms"},
        {val: "3.1", string: "3 1/2 Bathrooms"},
        {val: "4", string: "4 Bathrooms"},
        {val: "4.1", string: "4 1/2 Bathrooms"},
        {val: "5", string: "5 Bathrooms"},
    ],
    "zip" : [

    ]
};

我想做的是使用 for 循环在“zip”中动态生成一组邮政编码。到目前为止，我没有工作，因为我收到了一堆错误，例如意外的 token 等...

我假设我这样做是完全错误的，但这是我正在尝试做的:

"zip" : [
    for(i=43000; i<=45999;){
        {val: i, string: i},
        i++
    };
]

Answer 1

最简单的事情就是在对象初始化器之后做:

for(i=43000; i<=45999;i++){
    obj.zip.push({val: i, string: i});
}

(请注意，我移动了 i++，它与循环体无关。)(另请注意，除非您在某处声明了 i，否则成为 The Horror of Implicit Globals 的牺牲品。)(for block 后面没有 ;。:-) )

如果它是初始化程序的一部分真的很重要(这不太可能)，您可以使用您立即调用的临时函数:

"zip" : function() {
    var a = [];
    for(var i=43000; i<=45999;i++){
        a.push({val: i, string: i});
    }
    return a;
}()

...但我不会没有充分的理由。虽然我不确定为什么不...