原生js实现表格翻页和跳转

<table border="" cellspacing="" cellpadding="" id="table">
 <thead>
 <tr>
  <td>No</td>
  <td>Name</td>
  <td>Age</td>
 </tr>
 </thead>
 <tbody></tbody>
 <tfoot>
 <tr>
  <td colspan="3">
  <input type="button" name="pre-btn" id="pre" value="<" />
  <input type="text" name="page_num" id="page_num" value="" />
  <span id="cur_page"></span>
  <input type="button" name="jump" id="jump" value="跳转" />
  <input type="button" name="next-btn" id="next" value=">" />
  </td>
 </tr>
 </tfoot>
</table>

let datas = [
 [1, 'a', 16],
 [2, 'b', 20],
 [3, 'c', 22],
 [4, 'd', 44],
 [5, 'e', 11],
 [6, 'f', 12],
 [7, 'g', 13]
];
let cur_page = 0;
let t = document.querySelector('tbody');
let page_num = document.querySelector('#page_num');
let row_num = 2;
(() => jump_to(cur_page))();

function pre() {
 if (cur_page > 0) {
 cur_page--;
 jump_to(cur_page);
 }
}

function next() {
 if (cur_page < (datas.length / row_num) - 1) {
 cur_page++;
 jump_to(cur_page);
 }
}

function jump_to(page) {
 t.innerHTML = '';
 for (let i = page  row_num; i < (page + 1)  row_num && i < datas.length; i++) {
 let row = t.insertRow();
 for (let item of datas[i]) {
  row.insertCell().innerHTML = item;
 }
 }
 page_num.value = page + 1;
}

document.querySelector('#cur_page').innerText = `/${Math.ceil(datas.length / row_num)}`;
document.querySelector('#pre').onclick = () => pre();
document.querySelector('#next').onclick = () => next();
document.querySelector('#jump').onclick = function() {
 if (page_num.value < (datas.length / row_num) + 1 && page_num.value - 1 !== cur_page && page_num.value > 0 && Number.isInteger(parseInt(page_num.value))) {
 cur_page = page_num.value - 1;
 jump_to(cur_page);
 }
};