js新手问题onclick怎么调用js

Question

 <li class="leftyicd" onclick="kcxxser('dzf',0,'leftnav','ercd','cdmx',3,0,29)" id="dzf0"><a  target="main">学前指导</a></li>
括号里的('dzf',0,'leftnav','ercd','cdmx',3,0,29)是怎么被调用出来的呢，特别新的小白，求大神指点

function kcxxser(obj,num,objz,erobj,ernum,nums,iserji,erlinum)
    {
        var dhz=document.getElementById(objz);
        var dhli=dhz.getElementsByTagName('li').length;
        for(i=0; i<dhli-erlinum; i++)
        {
            var aa=erobj+i;
            var changeid=obj+i;
            if(i==num)
            {
                document.getElementById(changeid).firstChild.style.background="url(/list_imager/kcxx_24.jpg) no-repeat center";
                document.getElementById(changeid).firstChild.style.color="#686868";
                document.getElementById(aa).style.display="block";
            }
            else
            {
                document.getElementById(changeid).firstChild.style.background="url(/list_imager/kcxx_21.jpg) no-repeat center";
                document.getElementById(changeid).firstChild.style.color="#034c89";
                document.getElementById(aa).style.display="none";
                if(iserji==0)
                {
                    for(j=0; j<nums; j++)
                    {
                        var erid=ernum+j;
                        document.getElementById(erid).style.background="url(/list_imager/left2_21.jpg) no-repeat center";
                        document.getElementById(erid).style.color="#034c89";
                    }
                }
            }
        }
    }

Answer 1

自己写的函数还不清楚参数干嘛用的？看代码obj,erobj,ernum是某些对象的前置
num是当前li所在焦点什么的
erobj是li的集合，num对应的li在其中

此函数类似tabs之类的插件，设置某个焦点tab