js常用自编函数整理

1.替换js地址栏参数值
//destiny是目标字符串，比如是http://www.huistd.com/?id=3&ttt=3
//par是参数名，par_value是参数要更改的值，调用结果如下：
//changeURLPar(test, 'id', 99); // http://www.huistd.com/?id=99&ttt=3
//changeURLPar(test, 'haha', 33); // http://www.huistd.com/?id=99&ttt=3&haha=33
function changeURLPar(destiny, par, par_value){
    var pattern = par+'=([^&]*)';
    var replaceText = par+'='+par_value;
    if (destiny.match(pattern)){
        var tmp = '/\\'+par+'=[^&]*/';
        tmp = destiny.replace(eval(tmp), replaceText);
        return (tmp);
    }else{
        if (destiny.match('[\?]')){
            return destiny+'&'+ replaceText;
        }else{
            return destiny+'?'+replaceText;
        }
    }
    return destiny+'\n'+par+'\n'+par_value;
}