jquery实现全选、反选以及删除、添加等功能

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<title></title>
    <script src="Jquery1.7.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $("#checkall").click(function () {
                if (this.checked) {
                    $('div span').html('取消全选');
                    $("table input").attr("checked", true);
                }
                else {
                    $('div span').html('全选');
                    $("table input").attr("checked", false);
                }
            });
            $("#checkelse").click(function () {
                $("table input").each(function () {
                    $(this).attr("checked", !$(this).attr("checked"))
                })
            });
            $("#Button1").click(function () {
                $("input:checked").each(function () {
                    $(this).parent().parent().remove();
                });
            });
            $("#Button2").click(function () {
                $('#tb1').append('<tr><td><input type="checkbox" /><td>' + Text1.value + '</td><td>' + Text2.value + '</td><td>' + Text3.value + '</td><td>' + Text4.value + '</td><td>' + Text5.value + '</td></tr>')
            });
        })
    </script>
</head>
<body>
    <div>
        <input id="checkall" type="checkbox" /><span>全选</span>
        <input id="checkelse" type="checkbox" />反选
        <input id="Button1" type="button" value="删除" />
        <input id="Button2" type="button" value="添加" />
        <table border="1" id="tb1">
            <tr>
                <td>
                    操作
                </td>
                <td align="center">
                    班级
                </td>
                <td>
                    姓名
                </td>
                <td>
                    薪水
                </td>
                <td>
                    就业单位
                </td>
                <td>
                    是否转正
                </td>
            </tr>
            <tr>
                <td>
                    <input id="Checkbox3" type="checkbox" value="0" />
                </td>
                <td>
                    10级net班
                </td>
                <td>
                    李丽
                </td>
                <td>
                    5000
                </td>
                <td>
                    联想公司
                </td>
                <td>
                    已转正
                </td>
            </tr>
            <tr>
                <td>
                    <input id="Checkbox4" type="checkbox" value="1" />
                </td>
                <td>
                    10级net班
                </td>
                <td>
                    王红
                </td>
                <td>
                    5000
                </td>
                <td>
                    联想公司
                </td>
                <td>
                    已转正
                </td>
            </tr>
            <tr>
                <td>
                    <input id="Checkbox5" type="checkbox" value="2" />
                </td>
                <td>
                    10级java班
                </td>
                <td>
                    张志
                </td>
                <td>
                    6000
                </td>
                <td>
                    微软公司
                </td>
                <td>
                    已转正
                </td>
            </tr>
            <tr>
                <td>
                    <input id="Checkbox6" type="checkbox" value="3" />
                </td>
                <td>
                    10级php班
                </td>
                <td>
                    孙江
                </td>
                <td>
                    4000
                </td>
                <td>
                    微软公司
                </td>
                <td>
                    已转正
                </td>
            </tr>
        </table>
        <input id="Text1" type="text" />
        <input id="Text2" type="text" /><input id="Text3" type="text" /><input id="Text4"
            type="text" />
        <input id="Text5" type="text" />
    </div>
</body>

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