JavaScript 修改 URL 地址栏参数的实现方法

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_r(tmp), replaceText);
return (tmp);
}
else
{
if (destiny.match('[\?]'))
{
return destiny+'&'+ replaceText;
}
else
{
return destiny+'?1=1&'+replaceText;
}
}
return destiny+'\n'+par+'\n'+par_value;
}