js学习——1

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表格全选</title>
    <style>
        table{
            border: 1px solid;
            width: 500px;
            margin-left: 30%;
        }
        td,th{
            text-align: center;
            border: 1px solid;
        }
        div{
            margin-top:10px;
            margin-left: 30%;
        }
        .out{

        }
    </style>
    <script>
        /**/
        //1、在页面加载完后绑定事件
        window.onload=function () {
            //2、给全选按钮绑定事件
            document.getElementById("unSelectAll").onclick= function () {
                //3、遍历全部的属性将未选中设置为选中
                var cbs=document.getElementsByName("cd");
                for (var i=0;i<cbs.length;i++){
                    cbs[i].spellcheck=false;
                }
            }
            document.getElementById("selectall").onclick= function () {
                //3、遍历全部的属性将未选中设置为选中
                var cbs=document.getElementsByName("cd");
                for (var i=0;i<cbs.length;i++){
                    cbs[i].spellcheck=true;
                }
            }
            document.getElementById("selcetRev").onclick= function () {
                //3、遍历全部的属性将未选中设置为选中
                var cbs=document.getElementsByName("cd");
                for (var i=0;i<cbs.length;i++){
                    cbs[i].spellcheck=false;
                }
            }
            document.getElementById("firstCB").onclick= function () {
                //3、遍历全部的属性将未选中设置为选中
                var cbs=document.getElementsByName("cd");
                alert(this);
                for (var i=0;i<cbs.length;i++){
                    cbs[i].spellcheck=false;
                }
            }
            document.getElementsByTagName("tr"){
                for (var i=0;i<trs.length;i++){

                }
            }
        }
    </script>
</head>
<body>
<table>
    <caption>学生信息表</caption>
    <tr>
        <th><input type="checkbox" name="cd" id="firstCB"></th>
        <th>编号</th>
        <th>姓名</th>
        <th>性别</th>
        <th>操作</th>
    </tr>

    <tr>
        <td><input type="checkbox" name="cd"></td>
        <td>1</td>
        <td>令狐冲</td>
        <td>男</td>
        <td><a href="javascript:void(0)">删除</a></td>
    </tr>
    <tr>
        <td><input type="checkbox" name="cd"></td>
        <td>2</td>
        <td>任我行</td>
        <td>男</td>
        <td><a href="javascript:void(0)"></a>删除</td>
    </tr>
    <tr>
        <td><input type="checkbox"></td>
        <td>3</td>
        <td>岳不群</td>
        <td>？</td>
        <td><a href="javascript:void(0)"></a> 删除</td>
    </tr>



</table>
<div>
    <input type="button" id="selectall" value="全选">
    <input type="button" id="unSelectAll" value="全不选">
    <input type="button" id="selcetRev" value="反选">
</div>
</body>
</html>
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