替换url参数值，截除问号后参数, 获取url参数

1.替换url参数值

function replaceUrl(url, arg, val){
        var pattern = arg+'=([^&]*)';
        var replaceText = arg+'='+val;
        return url.match(pattern) ? url.replace(eval('/('+ arg+'=)([^&]*)/gi'), replaceText) : (url.match('[?]') ? url+'&'+replaceText : url+'?'+replaceText);
    }

document.write(replaceUrl('http://www.t.com/test.php?class_id=3&id=2', 'id', 4));

2.截除？后字符串

function getQMark(my_url){
//如果url带问号
    var qMark;
    if(my_url.indexOf("?") != -1){
          qMark = my_url.split("?")[1];
    }
    return qMark;
}

3.获取链接参数

function GetRequest() {
        var url = location.search; //获取url中"?"符后的字串
        var theRequest = new Object();
        if (url.indexOf("?") != -1) {
            var str = url.substr(1);
            strs = str.split("&");
            for(var i = 0; i < strs.length; i ++) {
                theRequest[strs[i].split("=")[0]]=unescape(strs[i].split("=")[1]);
            }
        }
        return theRequest;
};
GetRequest()

参考：https://blog.csdn.net/qq_41802862/article/details/88566922