JS替换url中的参数

[墨香年少 32]

<script>
/* 
* 替换URL的参数值
* url 目标url
* arg 需要替换的参数名称 
* arg_val 替换后的参数的值 
* return url 参数替换后的url 
*/
function changeURLArg(url, arg, arg_val) {
    var pattern = arg + '=([^&]*)';
    var replaceText = arg + '=' + arg_val;
    if (url.match(pattern)) {
        var retuenUrl = url;
        var temp = '/(\&' + arg + '=)([^&]*)/gi';
        if (eval(temp).test(retuenUrl)) {
        retuenUrl = retuenUrl.replace(eval(temp), '&' + replaceText);
        }
        var temps = '/([\?])(' + arg + '=)([^&]*)/gi';
        if (eval(temps).test(retuenUrl)) {
        retuenUrl = retuenUrl.replace(eval(temps), '?' + replaceText);
        }
        return retuenUrl;
    }
    else {
        // if (url.match('[\?]')) {
        if (url.indexOf('?') > 0) {
            return url + "&" + replaceText;
        } else {
            return url + "?" + replaceText;
        }
    }
    return url + '\n' + arg + '\n' + arg_val;
}
document.write(changeUrlArg('http://www.abcd.com/test.testhtml?typeId=3&id=2&user_id=1', 'id', 5));
</script>