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<a href="javascript:void(0);" id="next" class="btn-red">next page</a>
on the page There is a toolbar with a "Next Page" button. Clicking this button will refresh the next page of information.
Below I find the next related parts in js:

next:function(n){return ir(n,"nextSibling")}
function ir(n,t){do n=n[t];while(n&&n.nodeType!==1);return n}

But based on this information, I still can't know how the page is calculated after clicking "Next Page". Can anyone help me analyze it? I just started JavaScript and only understand the basic syntax.
Attached is the web address: http://www.ikanman.com/comic/...
is the toolbar on the page.