From http://blog.sina.com.cn/s/blog_62d9b0bf01016yv5.html

URL解析

function ParseURL(arg){
    var url         = arg,
        regexp      = /([^\?]*)\??([^#]*)#(.*)/g,
        regexpParam = /([^&]*)=([^&]*)/g,
        urlExec     = regexp.exec(url),
        _host       = urlExec[1],
        _urlparam   = urlExec[2],
        _hashparam  = urlExec[3];


    function parseParam(paramStr){
        
        var param = {},
            reg   = paramStr.match(regexpParam);

        for(var i=0,rl=reg.length;i
        
            var item      = reg[i],
                itemSplit = item.split('=');
                itemKey   = itemSplit[0],
                itemVal   = itemSplit[1];
            
            param[itemKey] = itemVal;
        }
        return param;
    
    }    
    // 获取url的参数
    function urlParam(){
        return parseParam(_urlparam);
    }
    //获取hash的参数
    function hashParam(){
        return parseParam(_hashparam);
    
    }
    this.param     = urlParam;
    this.hashParam = hashParam;


    //按关键词搜索并返回value 
    function search(key){
        var regexp   = new RegExp(key+'=[^&]*','g'),
            urlMatch = url.match(regexp);

            for(var i=0,ul=urlMatch.length;i
                urlMatch[i]=urlMatch[i].split('=')['1'];
                
            }
            
            return urlMatch;
    }
    this.search=search;
    
    this.scheme = /^([^:]*):/.exec(_host)[1];
    this.host   =  /\/\/([^\/]*)\//.exec(_host)[1];
    
    try{
        this.port   =  /:(\d*)$/.exec(_host)[1];
    }catch(e){
        this.port   =  '8080';
    }
    this.path   =  new RegExp(this.host+'([^:]*)').exec(_host)[1]; 

}



var parseURL = new ParseURL('http://image.baidu.com/fdsa/fd324/23442/i?ct=201326592&cl=2&nc=1&lm=-1&st=-1&tn=baiduimage&istype=2&fm=&pv=&z=0&word=��վǰ�˿���&fr=wenku&&&&&mmm=11#&st=-1&tn=baiduimage&istype=2&fm=&pv=&z=0&word=��վǰ�˿���&fr=wenku&tn=tntest&&&&qq=605003402');


console.log(parseURL.param());
console.log(parseURL.hashParam());
console.log(parseURL.search('qq'));
console.log(parseURL.scheme);
console.log(parseURL.host);
console.log(parseURL.port);
console.log(parseURL.path);