Url参数获取和更改

getUrlParam:function (name){
var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
var r = window.location.search.substr(1).match(reg);
if(r!=null)
return  unescape(r[2]);
return null;
}

getUrlParam:function (name){
var params = location.search.substr(1);
var ArrParam = params.split('&');
for(var i = 0; i <ArrParam.length; i ++){
if(ArrParam[i].split('=')[0] == name){
return ArrParam[i].split('=')[1];
        }
    }
}

changeURLPar:function(url,arg,arg_val){
var pattern=arg+'=([^&]*)'; 
var replaceText=arg+'='+arg_val; 
if(url.match(pattern)){ 
var tmp='/('+ arg+'=)([^&]*)/gi'; 
        tmp=url.replace(eval(tmp),replaceText); 
return tmp; 
    }else{ 
if(url.match('[\?]')){ 
return url+'&'+replaceText; 
        }else{ 
return url+'?'+replaceText; 
        } 
    } 
return url+'\n'+arg+'\n'+arg_val; 
}
//用法
var txt = window.location.href
changeURLPar(txt, 'type', 99)