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# js 实现表格排序
用 js 实现表格排序。
第一点击以降序排列，第二次点击以升序排列
html 代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Document</title>
</head>
<body>
<table border="1">
<tr>
<th>学号</th>
<th>名字</th>
<th id="sort">成绩</th>
</tr>
<tr>
<td>1002</td>
<td>小铭</td>
<td>34</td>
</tr>
<tr>
<td>1003</td>
<td>小红</td>
<td>64</td>
</tr>
<tr>
<td>1004</td>
<td>小黄</td>
<td>24</td>
</tr>
<tr>
<td>1005</td>
<td>小米</td>
<td>53</td>
</tr>
<tr>
<td>1006</td>
<td>小蒋</td>
<td>78</td>
</tr>
<tr>
<td>1007</td>
<td>小捷</td>
<td>97</td>
</tr>
<tr>
<td>1004</td>
<td>小邓</td>
<td>65</td>
</tr>
</table>
</body>
</html>
js 代码
<script>
var sort = document.getElementById('sort');
var up = true
sort.onclick = function(){
var table = document.getElementsByTagName('table')[0];
var tr = table.getElementsByTagName('tr');
var array = [];
for (var i = 1;i < tr.length;i++) {
array.push(tr[i]);
}
if (up) {
SortUp (array);
up = false;
} else {
SortDown (array);
up = true;
}
for (var i = 0; i < array.length; i++){
table.appendChild(array[i]);
}
}
function SortUp(array){
for (var i = 0;i < array.length;i++) {
for (var j = i + 1;j < array.length;j++) {
if (array[j] === undefined) {
continue;
}
if (array[i].getElementsByTagName('td')[2].innerText <= array[j].getElementsByTagName('td')[2].innerText) {
var temp = array[i];
array[i] = array[j];
array[j] = temp;
}
}
}
}
function SortDown(array){
for (var i = 0;i < array.length;i++) {
for (var j = i + 1;j < array.length;j++) {
if (array[j] === undefined) {
continue;
}
if (array[i].getElementsByTagName('td')[2].innerText >= array[j].getElementsByTagName('td')[2].innerText) {
var temp = array[i];
array[i] = array[j];
array[j] = temp;
}
}
}
}
</script>