window.location.indexOf 在 Javascript 中不起作用 [英] window.location.indexOf not working in Javascript

问题描述

以下是我所拥有的.

var myString = "http://localhost:8888/www.smart-kw.com/";
alert(myString.indexOf("localhost"));

这给了我警报...但是，如果我将 var myString = "http://localhost:8888/www.smart-kw.com/"; 更改为 var myString =window.location;，它不起作用(我没有收到警报).

This give me alert... however if I change var myString = "http://localhost:8888/www.smart-kw.com/"; to var myString = window.location;, it won't work (I don't get alert).

var myString = window.location;
alert(myString.indexOf("localhost"));

推荐答案

window.location 是一个访问器属性，获取它的值会给你一个对象，而不是一个字符串，所以它没有 indexOf 函数.(人们有时认为它是一个字符串是完全可以理解的，因为当您设置它的值时，访问器属性的设置器接受一个字符串；即，window.location = "some url"; 确实有效.但是当你得到它时，你不会得到一个字符串.)

window.location is an accessor property, and getting its value gives you an object, not a string, and so it doesn't have an indexOf function. (It's perfectly understandable that people sometimes think it's a string, since when you set its value, the accessor property's setter accepts a string; that is, window.location = "some url"; actually works. But when you get it, you don't get a string.)

您可以使用 window.location.toString()、String(window.location) 或 window.location.href 来获取如果您愿意，可以使用一个字符串，或者使用 其各种属性中的任何一个 检查细节.从链接中，给出示例网址 http://www.example.com:80/search?q=devmo#test:

You can use window.location.toString(), String(window.location), or window.location.href to get a string for it if you like, or use any of its various properties to check specifics. From the link, given example url http://www.example.com:80/search?q=devmo#test:

• hash:URL 中# 符号后面的部分，包括# 符号.您可以侦听 hashchange 事件以获取有关支持浏览器中哈希更改的通知.
  示例:#test
• host:主机名和端口号.
  示例:www.example.com:80
• hostname:主机名(不含端口号).
  示例:www.example.com
• href:整个 URL.
  示例:http://www.example.com:80/search?q=devmo#test
• pathname:路径(相对于主机).
  示例:/search
• port:URL 的端口号.
  示例:80
• protocol:URL 的协议.
  示例:http:
• search:URL 中 ?符号，包括?符号.
  示例:?q=devmo

例如，对于您引用的示例，您可以检查 window.location.hostname === "localhost".

For instance, for your quoted example, you might check window.location.hostname === "localhost".

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