javascript 如何使用 document.referrer 获取 url 的一部分？
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How to get the parts of a url using document.referrer?
提问by FairyQueen
I need to use document.referrerto get the previous URL I also need to be able to get the parts of the URL like:
我需要使用document.referrer来获取以前的 URL 我还需要能够获取 URL 的部分，例如：
window.location.protocol
window.location.host
window.location.pathname
but I can't figure out how to do it with document.referrer. Anyone got any ideas?
但我不知道如何使用document.referrer. 有人有任何想法吗？
回答by kennebec
You can create an a element with the referrer as its url.
您可以创建一个以引用为 URL 的元素。
a elements (with hrefs) can act like location objects
a 元素（带有 hrefs）可以充当位置对象
var a=document.createElement('a');
a.href=document.referrer;
alert([a.protocol,a.host,a.pathname].join('\n'));
a='';
回答by Aaron Powell
There's no equivalent to window.locationwith regards to document.referrerso your only option will be to break down the string itself. You could write a regex to do that or rely on a series of string splits:
有没有相当于window.location与问候document.referrer所以你唯一的选择将是打破字符串本身。您可以编写一个正则表达式来做到这一点，也可以依靠一系列字符串拆分：
var parts = document.referrer.split('://')[1].split('/');
var protocol = document.referrer.split('://')[0];
var host = parts[0];
var pathName = parts.slice(1).join('/');
回答by rodneyrehm
If you want the convenience and can afford the weight, have a look at URI.jsor one of the suggested URL parsers. If you don't need anything fancy, <a>s href decompositionwill do the job just fine.
如果您想要方便并且负担得起重量，请查看URI.js或建议的URL 解析器之一。如果您不需要任何花哨<a>的东西，s href 分解就可以很好地完成工作。
