利用a标签解析url

function parseURL(url) {    var a =  document.createElement('a');    a.href = url;    return {        source: url,        protocol: a.protocol.replace(':',''),        host: a.hostname,        port: a.port,        query: a.search,        params: (function(){            var ret = {},                seg = a.search.replace(/^\?/,'').split('&'),                len = seg.length, i = 0, s;            for (;i<len;i++) {                if (!seg[i]) { continue; }                s = seg[i].split('=');                ret[s[0]] = s[1];            }            return ret;        })(),        file: (a.pathname.match(/\/([^\/?#]+)$/i) || [,''])[1],        hash: a.hash.replace('#',''),        path: a.pathname.replace(/^([^\/])/,'/$1'),        relative: (a.href.match(/tps?:\/\/[^\/]+(.+)/) || [,''])[1],        segments: a.pathname.replace(/^\//,'').split('/')    };}