js实现修改参数数据

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; } 

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