JavaScript 获取 URL 各组成部分详解

var a=location.href;
console.log(a);　// “http://www.cnblogs.com/wuxibolgs329/p/5261577.html#flag?test=12345”

var host = window.location.host; //www.cnblogs.com
var host2 = document.domain; //www.cnblogs.com
var a = location.hostname;　　//www.cnblogs.com

var a=location.protocol;
console.log(a);　//http:

var a=location.port;
console.log(a);

var a=location.pathname;
console.log(a);

var a=window.location.hash; 
var b=a.substr(1); 
console.log(b);　// flag?test=12345

// 此时案例地址变为“http://www.cnblogs.com/wuxibolgs329/p/5261577.html?test=12345”。得到 test=12345
var a=location.search;
var b=a.substr(1);
console.log(b);　
//如果案例依旧是“http://www.cnblogs.com/wuxibolgs329/p/5261577.html#flag?test=12345”，则需下面的写法，得到 test=12345
var a=location.href;
var b=a.substr(a.lastIndexOf('?')+1);
console.log(b);

var a=location.href;
var b=a.substring(a.lastIndexOf('=')+1);
console.log(b); // 12345