寻找关于我的URL解析脚本（Javascript）的一般反馈

我对Javascript相当陌生，并汇编了以下内容（部分来自在线示例，其余由我编写）：

这是可靠的，我只是想知道我违反了多少最佳实践。如果有人对本脚本的后半部分提供一般性反馈，我们将不胜感激

包含的两个功能是：（1）在页面上捕获传入网站访问者的推荐数据，包括用于分析的URL查询字符串，并将其存储到cookie中。（2） 当访问者完成表单时，脚本将读取cookie的URL值，将此URL解析为段，并将段数据写入表单上预先存在的隐藏输入

这将捕获和解析的URL示例：

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谢谢大家!

如果你不想跟踪访问你网站的访问者，你为什么需要使用cookie来存储这些数据呢？

我意识到这很奇怪。这基本上是针对产品中当前限制的一种解决方法，而其他人则在进行真正的修复。说来话长，真的。客户希望将转介数据（来自初始非域转介者）存储在表单提交中。

function storeRef() { //this function stores document.referrer to a cookie if the cookie is not already present
    var isnew = readCookie('cookiename'); //set var via read-cookie function's output
        if (isnew == null) {
            var loc=document.referrer; 
            createCookie('cookiename',loc,0,'example.com'); //create cookie via function with name, value, days, domain 
        }
}

function printQuery() { //function to parse cookie value into segments
    var ref=readCookie('cookiename'); //write cookie value to variable
    var refElement = ref.split(/[?&]/); //create array with variable data, separated by & or ?. This is for domain info primarily.
    var queryString = {}; //From http://stevenbenner.com/2010/03/javascript-regex-trick-parse-a-query-string-into-an-object/
    ref.replace(
        new RegExp("([^?=&]+)(=([^&]*))?", "g"),
        function($0, $1, $2, $3) { queryString[$1] = $3; } 
    );
//write segments to form field names below.     
    document.getElementsByName('example1')[0].value = refElement[0]; //exampleX is a form hidden input's name. I can not use getElementById here.
//need to be able to manually define these, which is why they aren't in a loop, though I'm not sure how to loop an array referenced in this way
    document.getElementsByName('example2')[0].value = queryString['utm_source']; 
    document.getElementsByName('example3')[0].value = queryString['utm_medium'];
    document.getElementsByName('example4')[0].value = queryString['utm_term'];
    document.getElementsByName('example5')[0].value = queryString['utm_content'];
    document.getElementsByName('example6')[0].value = queryString['utm_campaign'];
    document.getElementsByName('example7')[0].value = queryString['utm_adgroup'];
    document.getElementsByName('example8')[0].value = queryString['utm_kw'];
    document.getElementsByName('example9')[0].value = queryString['kw'];
    document.getElementsByName('example10')[0].value = queryString['mt'];
    document.getElementsByName('example11')[0].value = queryString['mkwid'];
    document.getElementsByName('example12')[0].value = queryString['pcrid'];
}