javascript - 我怎样才能扩展一个javascript对象？

Question

我有 2 个 js 文件，它们应该处理我的应用程序的配置。在第一个中，我有一般配置，在第二个中，我有更具体的配置。第二个文件应该扩展第一个文件，但是当我尝试从中访问对象时，它说它是未定义的。代码如下:

第一个文件:

var Config = {

    application.name = ""

};

第二个文件:

Config.menus.mainMenu = [

    {
        "route": "/address-validation",
        "prefix": "address",
        "label": "Address Validation",
        "icon": "icon-8"
    }, 
    {
        "route": "/reports/onhand",
        "prefix": "reports",
        "label": "Reports",
        "icon": "icon-9"
    }, 
    {
        "route": "/performance/sales",
        "prefix": "performance",
        "label": "Performance",
        "icon": "icon-10"
    }, 
    {
        "route": "/taxes/nonhumanminnesota",
        "prefix": "taxes",
        "label": "Taxes",
        "icon": "icon-11"
    }, 
    {
        "route": "/utils/product-location-mass-assignation",
        "prefix": "util",
        "label": "Utils",
        "icon": "icon-12"
    }, 
    {
        "route": "/administration",
        "prefix": "administration",
        "label": "Administration",
        "icon": "icon-7"
    }
];

Answer 1

Config.menus 是未定义，因此您无法对其设置Config.menus.mainMenu。

在你的第二个文件中尝试这个:

Config.menus = Config.menus || {}; // Set `Config.menus` to an empty object if it's undefined
Config.menus.mainMenu = [          // The rest of your code here