使用JavaScript获取绝对URL-蒲公英云

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！