function delTheSameForCompare() { var tbody = document.getElementById("tal");//获取到指定的tbody var tr = tbody.children;//获取tbody下面全部的tr if (document.getElementById("checkDiffer").checked) { for (var i = 0; i < tr.length; i++) //遍历tr { if (i >= 2) { var tds = tr[i].children;//找到tr下面的子元素 if (tds[1].innerText == tds[2].innerText) //对比td中的内容如果相同的话 隐藏 { tr[i].style.display = "none" } } } } else { var tbody = document.getElementById("tal"); var tr = tbody.children; for (var i = 0; i < tr.length; i++) { tr[i].style.display = "block" } } }