string.prototype.trim=function(){return this.replace(/(^\s*)|(\s*$)/g, "");}
string.prototype.ltrim=function(){return this.replace(/(^\s*)/g,"");}
string.prototype.rtrim=function(){return this.replace(/(\s*$)/g,"");} 
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('/')
    };
    }
    //替换myurl中的同名参数值
    function replaceurlparams(myurl, newparams) { 
    for (var x in newparams) {
    var hasinmyurlparams = false;
    for (var y in myurl.params) {
    if (x.tolowercase() == y.tolowercase()) {
    myurl.params[y] = newparams[x];
    hasinmyurlparams = true;
    break;
    }
    }
    //原来没有的参数则追加
    if (!hasinmyurlparams) {
    myurl.params[x] = newparams[x];
    }
    }
    var _result = myurl.protocol + "://" + myurl.host + ":" + myurl.port + myurl.path + "?";
    for (var p in myurl.params) {
    _result += (p + "=" + myurl.params[p] + "&");
    }
    if (_result.substr(_result.length - 1) == "&") {
    _result = _result.substr(0, _result.length - 1);
    }
    if (myurl.hash != "") {
    _result += "#" + myurl.hash;

    }

    return _result;

    }