以下是我的解决方案：jsfiddle

下面的方法返回一个包含给定URL参数的字典。如果没有参数，则为空。

function getParams(url){
    var paramsStart = url.indexOf('?');
    var params = null;

    //no params available
    if(paramsStart != -1){
        var paramsString = url.substring(url.indexOf('?') + 1, url.length);

        //only '?' available
        if(paramsString != ""){
            var paramsPairs = paramsString.split('&');

            //preparing
            params = {};
            var empty = true;
            var index  = 0;
            var key = "";
            var val = "";

            for(i = 0, len = paramsPairs.length; i < len; i++){
                index = paramsPairs[i].indexOf('=');

                //if assignment symbol found
                if(index != -1){
                    key = paramsPairs[i].substring(0, index);
                    val = paramsPairs[i].substring(index + 1, paramsPairs[i].length);

                    if(key != "" && val != ""){

                        //extend here for decoding, integer parsing, whatever...

                        params[key] = val;

                        if(empty){
                            empty = false;
                        }
                    }                    
                }
            }

            if(empty){
                params = null;
            }
        }
    }

    return params;
}

在我的情况下（重定向到具有所有子url的新域）：：

window.location.replace("https://newdomain.com" + window.location.pathname);

您可以添加一个输入框，然后要求用户将值复制到其中……这非常简单：

<h1>Hey User! Can you please copy the value out of the location bar where it says like, &m=2? Thanks! And then, if you could...paste it in the box below and click the Done button?</h1>
<input type='text' id='the-url-value' />
<input type='button' value='This is the Done button. Click here after you do all that other stuff I wrote.' />

<script>
//...read the value on click

好吧，但说真的。。。我发现了这段代码，它似乎很有用：

http://www.developerdrive.com/2013/08/turning-the-querystring-into-a-json-object-using-javascript/

function queryToJSON() {
    var pairs = location.search.slice(1).split('&');

    var result = {};
    pairs.forEach(function(pair) {
        pair = pair.split('=');
        result[pair[0]] = decodeURIComponent(pair[1] || '');
    });

    return JSON.parse(JSON.stringify(result));
}

var query = queryToJSON();

window.location.href.split("?")

则忽略第一个索引

Array.prototype.slice.call(window.location.href.split("?"), 1) 

返回url参数数组

var paramArray = Array.prototype.slice.call(window.location.href.split(/[?=]+/), 1);
var paramObject = paramArray.reduce(function(x, y, i, a){ (i%2==0) ?  (x[y] = a[i+1]) : void 0; return x; }, {});

paramObject包含映射为js对象的所有参数

// Read a page's GET URL variables and return them as an associative array.
function getUrlVars()
{
    var vars = [], hash;
    var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
    for(var i = 0; i < hashes.length; i++)
    {
        hash = hashes[i].split('=');
        vars.push(hash[0]);
        vars[hash[0]] = hash[1];
    }
    return vars;
}

// Usage for URL: http://my.site.com/location?locationId=53cc272c0364aefcb78756cd&shared=false
var id = getUrlVars()["locationId"];

从这里得到：http://jquery-howto.blogspot.ru/2009/09/get-url-parameters-values-with-jquery.html

您可以通过以下函数实现：

function getParameter(parameterName){
        let paramsIndex = document.URL.indexOf("?");
        let params="";
        if(paramsIndex>0)
            params=document.URL.substring(paramsIndex+1, document.URL.length).split("&");
        let result = [];
        for(let i=0;i<params.length;i++)
        {
            console.warn(params[i].split("=")[0].toString()+ "," + params[i].split("=")[1].toString());
            var obj = {"key":params[i].split("=")[0].toString(),"value":params[i].split("=")[1].toString()};
            result.push(obj);
        }
        return passedValue = result.find(x=>x.key==parameterName).value;
    }

现在您可以使用getParameter（“parameterName”）获取参数值