Detailed explanation of how to use JavaScript paging component

<ul class="pagination" id="jsPagination">
    <li>Home</li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li>Last page</li>
</ul>

.hide{
    display: none!important;
}
.pagination{
    margin: 0 auto;
    padding: 0;
    list-style: none;
    text-align: center;
}
.pagination li{
    display: inline-block;
    width: 30px;
    height: 30px;
    overflow: hidden;
    line-height: 30px;
    margin: 0 5px 0 0;
    font-size: 14px;
    text-align: center;
    border: 1px solid #00bc9b;
    color: #00bc9b;
    cursor: pointer;
}
.pagination li.current,
.pagination li:hover{
    background: #00bc9b;
    color: #ffffff;
}
.demo {
    margin: 10px 0;
    padding: 10px;
    background: #eeeeee;
    text-align: center;
}

function pagination(total, current) {
        var ele = document.getElementById('jsPagination');
        //for demo1
        if(current-2>=1&¤t+2<=total)
        {
            var page=ele.firstChild.nextSibling;
            if(current-2==1)
                page.className='hide';
            for(var i=current-2,p=current-2;i<=current+2;p++,i++)
            {
                page=page.nextSibling;
                console.log(page);
                page=page.nextSibling;
                console.log(page);
                page.innerHTML=i;
                if(i==current)
                    page.className='current';
            }
            if(current+2==total)
            {
                var last=page.nextSibling.nextSibling;
                last.className='hide';
            }
        }
        //for demo2
        else if(total==0)
        {
            ele.className='pagination hide';
        }
        //for demo3
        else if(total<=5)
        {
            var fir=ele.firstChild.nextSibling;
            fir.className='hide';
            var page=fir;
            for(var i=1;i<=5;i++) {
                page = page.nextSibling.nextSibling;
                if (i <= total) {
                    page.innerHTML=i;
                    if(i==current)
                        page.className='current';
                }
                else
                {
                    page.className='hide';
                }
 
            }
            var last=page.nextSibling.nextSibling;
            last.className='hide';
        }
        //for demo4
        else if(current-2<=0)
        {
            var page=ele.firstChild.nextSibling;
            page.className='hide';
            for(var i=1;i<=5;i++) {
                page = page.nextSibling.nextSibling;
                page.innerHTML=i;
                    if(i==current)
                        page.className='current';
            }
 
        }
        //for demo5
        else if(current+2>total)
        {
            var page=ele.firstChild.nextSibling;
            for(var i=total-4;i<=total;i++) {
                page = page.nextSibling.nextSibling;
                page.innerHTML=i;
                if(i==current)
                    page.className='current';
            }
            var last=page.nextSibling.nextSibling;
            last.className='hide';
 
        }
}