京东前端第一题，预览都可以正常添加和运行，就是0%，又挂一家

我也是非常纳闷第一题table题，为什么我做好改了1.5h了，在自己电脑上调试全部OK了，都是0%，麻烦老兄帮我看看我究竟哪里错。 ``` <script> function add(items) { let parent = document.getElementsByTagName('tbody')[0].innerHTML; let children = ''; let addValue = 0; let addCount = 0; for(let i of items){ children += '<tr><td>' + i.name + '</td><td>' + i.price.toString() + '</td><td><a href="javascript:void(0);">删除</a></td></tr>'   addValue += i.price; addCount++; } parent += children; document.getElementsByTagName('tbody')[0].innerHTML = parent; let total = document.getElementsByTagName('tfoot')[0].childNodes[0].childNodes[1].innerText; total = (Number(total.slice(0, total.indexOf('('))) + addValue).toFixed(2).toString() + '(' + (Number(total.slice(total.indexOf('(') + 1, total.indexOf('件'))) + addCount).toString() + '件商品)'; document.getElementsByTagName('tfoot')[0].childNodes[0].childNodes[1].innerText = total; } function bind() { let parent = document.getElementsByTagName('tbody')[0]; let total = document.getElementsByTagName('tfoot')[0].childNodes[0].childNodes[1].innerText; parent.addEventListener('click', (e) => { if(e.target.nodeName == 'A'){ debugger; let itemPrice = Number(e.target.parentNode.previousSibling.innerText); total = (Number(total.slice(0, total.indexOf('('))) - itemPrice).toFixed(2).toString() + '(' + (Number(total.slice(total.indexOf('(') + 1, total.indexOf('件'))) - 1).toString() + '件商品)'; parent.removeChild(e.target.parentNode.parentNode); document.getElementsByTagName('tfoot')[0].childNodes[0].childNodes[1].innerText = total; } }) } add([{'name': '啊啊', 'price': 6},{'name': '啊啊1', 'price': 7},{'name': '啊啊123', 'price': 89}]); bind(); </script> ```