表格排序和加升符、降符

这里写图片描述

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            table{border:1px solid black; width: 500px;border-collapse: collapse; }
            tr td{border:1px solid black;}
            td{position: relative;}
            .up:after,.down:after{
                    content: "";
                    width: 0;
                    height: 0;
                    border-width:  5px;
                    border-style: solid;
                    position: absolute;
                    right: 5px;
            }

            .up:after{
                    border-color: transparent transparent #f00 transparent;
                    top: 2px;
            }

            .down:after{
                    border-color:  #f00 transparent transparent transparent;
                    top: 8px;
            }
        </style>
    </head>
    <body>
        <table id="tb1">
            <thead align="center" <tr>
                <td>学号</td>
                <td>姓名</td>
                <td>语文</td>
                <td>数学</td>
                <td>总分</td>
                <td>操作</td>
                </tr>
            </thead>
            <tbody align="center">
                <tr>
                    <td>7</td>
                    <td>Alexander</td>
                    <td>90</td>
                    <td>96</td>
                    <td>186</td>
                    <td></td>
                </tr>
                <tr>
                    <td>1</td>
                    <td>小明明</td>
                    <td>100</td>
                    <td>100</td>
                    <td>200</td>
                    <td></td>
                </tr>
                <tr>
                    <td>2</td>
                    <td>张三</td>
                    <td>90</td>
                    <td>60</td>
                    <td>150</td>
                    <td></td>
                </tr>
                <tr>
                    <td>3</td>
                    <td>李四</td>
                    <td>59</td>
                    <td>80</td>
                    <td>139</td>
                    <td></td>
                </tr>
                <tr>
                    <td>4</td>
                    <td>王五</td>
                    <td>80</td>
                    <td>85</td>
                    <td>165</td>
                    <td></td>
                </tr>
                <tr>
                    <td>5</td>
                    <td>小明</td>
                    <td>56</td>
                    <td>40</td>
                    <td>96</td>
                    <td></td>
                </tr>
                <tr>
                    <td>6</td>
                    <td>Victor</td>
                    <td>78</td>
                    <td>88</td>
                    <td>166</td>
                    <td></td>
                </tr>
                <tr>
                    <td>8</td>
                    <td>Amanda</td>
                    <td>96</td>
                    <td>99</td>
                    <td>195</td>
                    <td></td>
                </tr>
            </tbody>
        </table>
    </body>
    <script>
    //点击排序
    (function(){
        var oTds = document.getElementById('tb1').tHead.rows[0].children;
        for(var i=0;i<oTds.length-1;i++){
            (function(j){
                oTds[j].style.cursor = 'pointer';
                var status = 'asc';
                oTds[j].onclick = function(){
                    if(status =='asc'){
                        oTds[j].className='up';
                        status = 'desc';
                    }else{
                        oTds[j].className='down';
                        status = 'asc';
                    }
                    // status = status=='asc'?'desc':'asc';
                    sort(j,status);
                };
            })(i);
        }
    })()
    //给表格进行排序
    function sort(index, status){
        var tb1 = document.getElementById('tb1');
        var ary = [];
        for(var i=0;i<tb1.tBodies[0].rows.length;i++){
            ary.push(tb1.tBodies[0].rows[i]);
        }
        ary.sort(function(o1,o2){
            var val1 = o1.children[index].innerHTML;
            var val2 = o2.children[index].innerHTML;

            if(index==1){//对姓名排序
                return status=='desc' ? val1.localeCompare(val2) : val2.localeCompare(val1); 
            }
            //对数字排序
            return status=='desc' ? val2 - val1 : val1 - val2;
        });
        for (var i=0;i<ary.length;i++){
            tb1.tBodies[0].appendChild(ary[i]);
        }
    }
    </script>
</html>
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