js获取链接地址中参数的值

function getQueryValue(queryName)
{
    if(location.href.indexOf("?")==-1 || location.href.indexOf(name+'=')==-1){
        return '';
    }
    var queryString = location.href.substring(location.href.indexOf("?")+1);
    var parameters = queryString.split("&");
    var pos, paraName, paraValue;
    for(var i=0; i<parameters.length; i++){
        pos = parameters[i].indexOf('=');
        if(pos == -1) continue;
        paraName = parameters[i].substring(0, pos);
        paraValue = parameters[i].substring(pos + 1);
        if(paraName == queryName){
            return unescape(paraValue.replace(/\+/g, " "));
        }
    }
    return '';
}
alert(getQueryValue('type3'));