Window.location.protocol + '//' + window.location.host

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]

const full = location.protocol + '//' + location.host;

host

var url = window.location.host;

返回localhost: 2679

主机名

var url = window.location.hostname;

返回本地主机

为什么不使用:

let full = window.location.origin

var getBasePath = function(url) {
    var r = ('' + url).match(/^(https?:)?\/\/[^/]+/i);
    return r ? r[0] : '';
};