全选与全不选问题js

来源：互联网发布：cf手游刷经验软件编辑：程序博客网时间：2024/05/21 17:05

<!DOCTYPE HTML>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
        <title>无标题文档</title>
    </head>
    <body>
        <form>
          请选择你爱好:<br>
          <input type="checkbox" name="hobby" id="hobby1" checked="checked";> 音乐
          <input type="checkbox" name="hobby" id="hobby2"> 登山
          <input type="checkbox" name="hobby" id="hobby3"> 游泳
          <input type="checkbox" name="hobby" id="hobby4"> 阅读
          <input type="checkbox" name="hobby" id="hobby5"> 打球
          <input type="checkbox" name="hobby" id="hobby6"> 跑步 <br>
          <input type="button" value = "全选" onclick = "checkall();">
          <input type="button" value = "全不选" onclick = "clearall();">
          <p>请输入您要选择爱好的序号，序号为1-6:</p>
          <input id="wb" name="wb" type="text" >
          <input name="ok" type="button" value="确定" onclick = "checkone();">
        </form>
        <script type="text/javascript">
        function checkall(){
            var hobby = document.getElementsByTagName("input");
            for(var i = 0;i < hobby.length;i++){

                      hobby[i].checked = "checked";
                }
           //加了判断的
                   for(i = 0;i < hobby.length;i++){
                    if(hobby[i].type == "checkbox"){
                      hobby[i].checked = true;   }//另一种写法
                  }
        }
        }

function clearall(){
            var hobby = document.getElementsByName("hobby");
            for(i = 0;i < hobby.length;i++){
                hobby[i].checked = "";
                //写法2 hobby[i].checked = false;
}
        }

function checkone(){//只能选一个
            var j=document.getElementById("wb").value;
            var hobby = document.getElementById("hobby"+j);
            hobby.checked = true;    }


        </script>
    </body>
</html>

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