function getHost(url) {
var host = "null";
if(typeof url == "undefined"|| null == url) {
url = window.location.href;
}
var regex = /^\w+\:\/\/([^\/]*).*/;
var match = url.match(regex);
if(typeof match != "undefined" && null != match) {
host = match[1];
}
return host;
}
console.log(getHost('https://i.cnblogs.com/articles'))
标签：url,host,主机名,地址,var,null,match
From： https://www.cnblogs.com/zhulongxu/p/16621457.html