为什么不使用:

let full = window.location.origin

var http = location.protocol;
var slashes = http.concat("//");
var host = slashes.concat(window.location.hostname);

console.log(`${req.protocol}://${req.get('host')}/${req.originalUrl}`);

要求的事情。protocol -给出你使用的协议(例如HTTP) get(host) -给出带有端口号的主机名(例如localhost:8080)

使用ES6模板文字:

Const url = ' ${location.protocol}//${location.hostname}${location.port?':'+location.port: "} '; . getelementbyid(“结果”)。innerText = url; < div id = "结果" > < / div >

你可以简化为:

Const url = ' ${location.protocol}//${location.host} '; . getelementbyid(“结果”)。innerText = url; < div id = "结果" > < / div >

尝试使用正则表达式(Regex)，当你想要验证/提取东西或甚至用javascript做一些简单的解析时，它将非常有用。

正则表达式是:

/([a-zA-Z]+):\/\/([\-\w\.]+)(?:\:(\d{0,5}))?/

演示:

function breakURL(url){

     matches = /([a-zA-Z]+):\/\/([\-\w\.]+)(?:\:(\d{0,5}))?/.exec(url);

     foo = new Array();

     if(matches){
          for( i = 1; i < matches.length ; i++){ foo.push(matches[i]); }
     }

     return foo
}

url = "https://www.google.co.uk:55699/search?q=http%3A%2F%2F&oq=http%3A%2F%2F&aqs=chrome..69i57j69i60l3j69i65l2.2342j0j4&sourceid=chrome&ie=UTF-8"


breakURL(url);       // [https, www.google.co.uk, 55699] 
breakURL();          // []
breakURL("asf");     // []
breakURL("asd://");  // []
breakURL("asd://a"); // [asd, a, undefined]

现在你也可以进行验证了。

首先获取当前地址

var url = window.location.href

然后解析这个字符串

var arr = url.split("/");

你的网址是:

var result = arr[0] + "//" + arr[2]