javascript - 如何将字符串与对象键进行比较并获取该键的值？

Question

无论如何，我想做一些相对简单的事情。

我需要将页面的路径名与对象的 kv 对进行比较。例如:

if("pathname" === "key"){return value;}

差不多就这些了。我不确定如何在常规 Javascript 或 jQuery 中执行此操作。两者都可以接受。

你可以在这里看到我的 fiddle :http://jsfiddle.net/lz430/2rhds1x3/

JavaScript:

var pageID = "/electrical-electronic-tape/c/864";
var pageList = [{
    "/electrical-electronic-tape/c/864": "ElectronicTape",
    "/industrial-tape/c/889": "IndustrialTape",
    "/sandblasting-tape/c/900": "SandblastingTape",
    "/Foam-Tape/c/875": "FoamTape",
    "/double-coated-d-c-dhesive-tape/c/872": "DCTape",
    "/Adhesive-Transfer-Tape/c/919": "ATTape",
    "/Reflective-Tape/c/884": "ReflectiveTape",
    "/custom-moulding": "CustomMoulding",
    "/request-a-quote": "RequestQuote"
}];
var label = pageID in pageList;
$('.el').html(label);

Answer 1

首先，您的“pageList”应该只是一个普通对象，而不是数组中的对象:

var pageList = {
    "/electrical-electronic-tape/c/864": "ElectronicTape",
    "/industrial-tape/c/889": "IndustrialTape",
    "/sandblasting-tape/c/900": "SandblastingTape",
    "/Foam-Tape/c/875": "FoamTape",
    "/double-coated-d-c-dhesive-tape/c/872": "DCTape",
    "/Adhesive-Transfer-Tape/c/919": "ATTape",
    "/Reflective-Tape/c/884": "ReflectiveTape",
    "/custom-moulding": "CustomMoulding",
    "/request-a-quote": "RequestQuote"
};

然后您可以将“标签”设置为映射中的值:

var label = pageList[pageID] || "(not found)";

如果查找失败，上面语句的最后一点会将标签设置为“(未找到)”，这可能适用于也可能不适用于您的情况。