ES6风格，具有可配置参数。

/**
 * Get the current URL from `window` context object.
 * Will return the fully qualified URL if neccessary:
 *   getCurrentBaseURL(true, false) // `http://localhost/` - `https://localhost:3000/`
 *   getCurrentBaseURL(true, true) // `http://www.example.com` - `https://www.example.com:8080`
 *   getCurrentBaseURL(false, true) // `www.example.com` - `localhost:3000`
 *
 * @param {boolean} [includeProtocol=true]
 * @param {boolean} [removeTrailingSlash=false]
 * @returns {string} The current base URL.
 */
export const getCurrentBaseURL = (includeProtocol = true, removeTrailingSlash = false) => {
  if (!window || !window.location || !window.location.hostname || !window.location.protocol) {
    console.error(
      `The getCurrentBaseURL function must be called from a context in which window object exists. Yet, window is ${window}`,
      [window, window.location, window.location.hostname, window.location.protocol],
    )
    throw new TypeError('Whole or part of window is not defined.')
  }

  const URL = `${includeProtocol ? `${window.location.protocol}//` : ''}${window.location.hostname}${
    window.location.port ? `:${window.location.port}` : ''
  }${removeTrailingSlash ? '' : '/'}`

  // console.log(`The URL is ${URL}`)

  return URL
}

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

正如已经提到的，有一个尚未完全支持的window.location.origin，但不是使用它或创建一个新变量来使用，我更喜欢检查它，如果它没有设置为设置它。

例如;

if (!window.location.origin) {
  window.location.origin = window.location.protocol + "//" + window.location.hostname + (window.location.port ? ':' + window.location.port: '');
}

实际上我在几个月前写过关于window.location.origin的修复

Window.location.origin就足以得到相同的。

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