JS全选与反选 - 喵喵知识园

<!DOCTYPE html>
<html>
    <head>
    <meta charset="utf-8">
    <title></title>
    <style type="text/css">
        *{
            padding: 0;
            margin: 0;
        }
        .wrap{
            width: 300px;
            margin: 100px auto 0;
        }
        table{
            border-collapse: collapse;
             border-spacing: 0;
             border: 1px solid #c0c0c0;
             width: 300px;
        }
        td{
            border: 1px solid #d0d0d0;
        }
        th{
            background-color: #09c;
            font: bold 16px "微软雅黑";
            color: #FFFFFF;
        }
        td{
            font:14px "微软雅黑";
            text-align: center;
        }
        tbody tr{
            background-color: #f0f0f0;
        }
        tbody tr:hover{
            cursor: pointer;
            background-color: #fafafa;
        }
    </style>
</head>
<body>
    <div class="wrap">
        <table>
            <thead>
                <tr>
                    <th><input type="checkbox" id="j_cbAll" /></th>
                    <th>商品</th>
                    <th>价钱</th>
                </tr>
            </thead>
            <tbody id="j_tb">
                <tr>
                    <td><input type="checkbox" /></td>
                    <td>大豆</td>
                    <td>1.15</td>
                </tr>
                <tr>
                    <td><input type="checkbox" /></td>
                    <td>玉米</td>
                    <td>0.95</td>
                </tr>
                <tr>
                    <td><input type="checkbox" /></td>
                    <td>大米</td>
                    <td>3.15</td>
                </tr>
            </tbody>
        </table>
    </div>
    <script type="text/javascript">
        var j_cbAll=document.getElementById('j_cbAll');
        var j_tbs=document.getElementById('j_tb').getElementsByTagName('input');
        j_cbAll.onclick=function(){
            for(var i=0;i<j_tbs.length;i++){
                j_tbs[i].checked=!j_tbs[i].checked;
            }
        }
        
        
        for(i=0;i<j_tbs.length;i++){
            j_tbs[i].onclick=function(){
                var switch_of=true;
                for(i=0;i<j_tbs.length;i++){
                    if(!j_tbs[i].checked){
                        switch_of=false;
                        break;
                    }
                }
                j_cbAll.checked=switch_of;
            }
            
        }
            
        </script>
    </body>
</html>

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