使用JavaScript获取绝对URL

Dealing with URL formats can be a real nightmare.  Think of how just a few characters can effect a URL's absolute endpoint:

处理URL格式可能是一个真正的噩梦。 考虑几个字符如何影响URL的绝对端点：

starting or not starting with /

以/开头或不以/开头

starting with //

以//开头

starting with ?

开始于?

starting with #

以#开头

...and so on

...等等

What if you want an absolute URL though?  One that starts with http or https?  You can use an A element to get that absolute URL!

如果您想要一个绝对URL，该怎么办？ 一个以http或https开头的？ 您可以使用A元素获取该绝对URL！

JavaScript (The JavaScript)

I'm going to use a function that returns a function so that only one A element is ever created:

我将使用一个返回一个函数的函数，以便只创建一个A元素：

var getAbsoluteUrl = (function() { var a; return function(url) { if(!a) a = document.createElement('a'); a.href = url; return a.href; }; })();

No matter how you pass in the URL string, the URL will come out absolute.  Of course strings like `javascript:;` wont come out any different, but real qualified URLs will come out as absolute!

无论您如何传递URL字符串，URL都是绝对的。 当然，像javascript :;这样的字符串不会有任何不同，但是真正合格的URL绝对是绝对的！

翻译自: https://davidwalsh.name/get-absolute-url

相关资源：jdk-8u281-windows-x64.exe