设置全选

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>全选和全不选以及反选</title>
        <script>
            window.onload = function() {
                var checkedAll = document.getElementById("checkedAll");
                var checkedOne = document.getElementsByName("checkedOne");
                //全选和全不选事件
                checkedAll.onclick = function() {
                    if(checkedAll.checked == true){
                        for(var i = 0;i<checkedOne.length;i++) {
                            checkedOne[i].checked = true;
                        }
                    }else {
                        for(var i = 0;i<checkedOne.length;i++) {
                            checkedOne[i].checked = false;
                        }
                    }
                }
                //反选事件
                document.getElementById("reSelect").onclick = function() {
                    for(var i =0;i<checkedOne.length;i++) {
                        checkedOne[i].checked = !checkedOne[i].checked;
                    }
                }
            }
        </script>
    </head>
    <body>
        <table id="tbl" border="1" border-collapse="collapse" align="center" cellspacing="0" cellpadding="5" width="400" height="20">
            <thead>
                <tr>
                    <th><input type = "checkbox" id="checkedAll">全选</input></th>
                    <th>编号</th><th>姓名</th><th>年龄</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td><input type="checkbox" name="checkedOne"/></td>
                    <td>1</td><td>张三</td><td>12</td>
                </tr>
                <tr>
                    <td><input type="checkbox" name="checkedOne"/></td>
                    <td>2</td><td>李四</td><td>22</td>
                </tr>
                <tr>
                    <td><input type="checkbox" name="checkedOne" /></td>
                    <td>3</td><td>王五</td><td>13</td>
                </tr>
                <tr>
                    <td><input type="checkbox" name="checkedOne"/></td>
                    <td>4</td><td>马六</td><td>14</td>
                </tr>
                <tr>
                    <td><input type="checkbox" name="checkedOne"/></td>
                    <td>5</td><td>伍六七</td><td>17</td>
                </tr>
                <tr>
                    <td><input type="checkbox" name="checkedOne"/></td>
                    <td>6</td><td>梅花十三</td><td>17</td>
                </tr>
                <tr>
                    <td colspan=4><input type="button" value="反选" id="reSelect" /></td>
                </tr>
            </tbody>
        </table>
    </body>
</html>

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