JS——全选和全不选

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1、全选和全不选函数：

<script>
            function checkAll(){
                var checkAllEle = document.getElementById("checkAll");
                if(checkAllEle.checked==true){
                    var checkOnes = document.getElementsByName("checkOne");
                    for(var i=0;i<checkOnes.length;i++){
                        checkOnes[i].checked=true;
                    }
                }else{
                    var checkOnes = document.getElementsByName("checkOne");
                    for(var i=0;i<checkOnes.length;i++){
                        checkOnes[i].checked=false;
                    }
                }
            }
</script>
getElementById方法：返回对拥有指定ID的第一个对象的引用。
getElementsByName方法：返回带有指定名称的对象的集合。
 <tr>
            	<th><input type="checkbox" onclick="checkAll()" id="checkAll"/></th>
				<th bgcolor="blanchedalmond "align="middle" >序号</th>              
				<th bgcolor="blanchedalmond "align="middle ">学号</th>
				<th bgcolor="blanchedalmond "align="middle ">姓名</th>
				<th bgcolor="blanchedalmond "align="middle ">平时成绩</th>
				<th bgcolor="blanchedalmond "align="middle ">期末成绩</td>
				<th bgcolor="blanchedalmond "align="middle ">学期总成绩</th>
            </tr>
            
			<tr>
				<td><input type="checkbox" name="checkOne"/></td>
				<td align="middle ">1</td>
				<td align="middle ">20100300201</td>
				<td align="middle ">张小丽</td>
				<td align="middle ">95</td>
				<td align="middle ">95</td>
				<td align="middle ">95</td>
			</tr>

			<tr>
				<td><input type="checkbox" name="checkOne"/></td>
				<td bgcolor="grey "align="middle ">2</td>
				<td bgcolor="grey "align="middle ">20100300202</td>
				<td bgcolor="grey "align="middle ">李宁</td>
				<td bgcolor="grey "align="middle ">90</td>
				<td bgcolor="grey "align="middle ">88</td>
				<td bgcolor="grey "align="middle ">89</td>
			</tr>

			<tr>
				<td><input type="checkbox" name="checkOne"/></td>
				<td align="middle ">3</td>
				<td align="middle ">20100300203</td>
				<td align="middle ">刘梅</td>
				<td align="middle ">98</td>
				<td align="middle ">92</td>
				<td align="middle ">95</td>
			</tr>

			<tr>
				<td><input type="checkbox" name="checkOne"/></td>
				<td bgcolor="grey "align="middle ">4</td>
				<td bgcolor="grey "align="middle ">20100300204</td>
				<td bgcolor="grey "align="middle ">王刚</td>
				<td bgcolor="grey "align="middle ">98</td>
				<td bgcolor="grey "align="middle ">90</td>
				<td bgcolor="grey "align="middle ">94</td>
			</tr>

			<tr>
				<td><input type="checkbox" name="checkOne"/></td>
				<td align="middle ">5</td>
				<td align="middle ">20100300205</td>
				<td align="middle ">郑军</td>
				<td align="middle ">90</td>
				<td align="middle ">85</td>
				<td align="middle ">87</td>
			</tr>

			<tr>
				<td><input type="checkbox" name="checkOne"/></td>
				<td bgcolor="grey "align="middle ">6</td>
				<td bgcolor="grey "align="middle ">20100300206</td>
				<td bgcolor="grey "align="middle ">杨波</td>
				<td bgcolor="grey "align="middle ">80</td>
				<td bgcolor="grey "align="middle ">80</td>
				<td bgcolor="grey "align="middle ">80</td>
			</tr>

getElementById方法获取的是与属性在同一行的复选框的状态，如果已经选中就用getElementsByName方法获取一个集合，并对集合进行遍历将复选框的状态变为选中，否则，将复选框全部变为未选中。
2、完整代码：
<html>
    <head>
        <meta charset="utf-8">
        <title>全选和全不选</title>
        <script>
            function checkAll(){
                var checkAllEle = document.getElementById("checkAll");
                if(checkAllEle.checked==true){
                    var checkOnes = document.getElementsByName("checkOne");
                    for(var i=0;i<checkOnes.length;i++){
                        checkOnes[i].checked=true;
                    }
                }else{
                    var checkOnes = document.getElementsByName("checkOne");
                    for(var i=0;i<checkOnes.length;i++){
                        checkOnes[i].checked=false;
                    }
                }
            }
        </script>
    </head>

    <body>
        <table width="600" border="1"  align="center" cellpadding="5" cellspacing="3">
            <caption>成绩登记表</caption>
            <tr>
                <th><input type="checkbox" onclick="checkAll()" id="checkAll"/></th>
                <th bgcolor="blanchedalmond "align="middle" >序号</th>              
                <th bgcolor="blanchedalmond "align="middle ">学号</th>
                <th bgcolor="blanchedalmond "align="middle ">姓名</th>
                <th bgcolor="blanchedalmond "align="middle ">平时成绩</th>
                <th bgcolor="blanchedalmond "align="middle ">期末成绩</td>
                <th bgcolor="blanchedalmond "align="middle ">学期总成绩</th>
            </tr>
            
            <tr>
                <td><input type="checkbox" name="checkOne"/></td>
                <td align="middle ">1</td>
                <td align="middle ">20100300201</td>
                <td align="middle ">张小丽</td>
                <td align="middle ">95</td>
                <td align="middle ">95</td>
                <td align="middle ">95</td>
            </tr>

            <tr>
                <td><input type="checkbox" name="checkOne"/></td>
                <td bgcolor="grey "align="middle ">2</td>
                <td bgcolor="grey "align="middle ">20100300202</td>
                <td bgcolor="grey "align="middle ">李宁</td>
                <td bgcolor="grey "align="middle ">90</td>
                <td bgcolor="grey "align="middle ">88</td>
                <td bgcolor="grey "align="middle ">89</td>
            </tr>

            <tr>
                <td><input type="checkbox" name="checkOne"/></td>
                <td align="middle ">3</td>
                <td align="middle ">20100300203</td>
                <td align="middle ">刘梅</td>
                <td align="middle ">98</td>
                <td align="middle ">92</td>
                <td align="middle ">95</td>
            </tr>

            <tr>
                <td><input type="checkbox" name="checkOne"/></td>
                <td bgcolor="grey "align="middle ">4</td>
                <td bgcolor="grey "align="middle ">20100300204</td>
                <td bgcolor="grey "align="middle ">王刚</td>
                <td bgcolor="grey "align="middle ">98</td>
                <td bgcolor="grey "align="middle ">90</td>
                <td bgcolor="grey "align="middle ">94</td>
            </tr>

            <tr>
                <td><input type="checkbox" name="checkOne"/></td>
                <td align="middle ">5</td>
                <td align="middle ">20100300205</td>
                <td align="middle ">郑军</td>
                <td align="middle ">90</td>
                <td align="middle ">85</td>
                <td align="middle ">87</td>
            </tr>

            <tr>
                <td><input type="checkbox" name="checkOne"/></td>
                <td bgcolor="grey "align="middle ">6</td>
                <td bgcolor="grey "align="middle ">20100300206</td>
                <td bgcolor="grey "align="middle ">杨波</td>
                <td bgcolor="grey "align="middle ">80</td>
                <td bgcolor="grey "align="middle ">80</td>
                <td bgcolor="grey "align="middle ">80</td>
            </tr>
        </table>
</body>
</html>

 

　　



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