window.location.indexOf 在 Javascript 中不起作用

window.location.indexOf not working in Javascript

提问by Fahim Parkar

Below is what I have.

下面是我所拥有的。

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

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).

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

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

回答by T.J. Crowder

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

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 setter 接受一个字符串；也就是说，window.location = "some url";实际上是有效的。但是当您得到它时，您并没有得到一个字符串。）

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

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

• hash: The part of the URL that follows the # symbol, including the # symbol. You can listen for the hashchange event to get notified of changes to the hash in supporting browsers.
  Example: #test
• host: The host name and port number.
  Example: www.example.com:80
• hostname: The host name (without the port number).
  Example: www.example.com
• href: The entire URL.
  Example: http://www.example.com:80/search?q=devmo#test
• pathname: The path (relative to the host).
  Example: /search
• port: The port number of the URL.
  Example: 80
• protocol: The protocol of the URL.
  Example: http:
• search: The part of the URL that follows the ? symbol, including the ? symbol.
  Example: ?q=devmo

• hash: URL 中# 符号后面的部分，包括# 符号。您可以侦听 hashchange 事件以在支持的浏览器中获得有关哈希更改的通知。
  例子：#test
• host：主机名和端口号。
  例子：www.example.com:80
• hostname：主机名（不带端口号）。
  例子：www.example.com
• href: 整个网址。
  例子：http://www.example.com:80/search?q=devmo#test
• pathname: 路径（相对于主机）。
  例子：/search
• port: URL 的端口号。
  例子：80
• protocol: URL 的协议。
  例子：http:
• search: URL 后面的部分？符号，包括 ? 象征。
  例子：?q=devmo

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

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

回答by Alexander

As far as I know window.locationis a Location object.

据我所知window.location是一个Location object.

For instance, window.location.hrefwill give you the entire URL.

例如，window.location.href会给你整个 URL。

var url = window.location.href;
alert(url.indexOf("domain"));

But this kind of check is bound to trigger false-positives. You are better using window.location.hostnameproperty which holds the host name part.

但这种检查必然会引发误报。您最好使用window.location.hostname包含主机名部分的属性。

var hostname = window.location.hostname;
alert(hostname === "my.domain.com");

回答by Edward

I found a way to make this work:

我找到了一种方法来完成这项工作：

(window.location.href).indexOf("localhost") > -1)

I actually use this for my projects as conditionals and it works just fine.

我实际上在我的项目中使用它作为条件，它工作得很好。