JS 小练习

<!DOCTYPE HTML>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
    <title>无标题文档</title>
    <style type="text/css">
        /*#hobby1{*/
            /*checked:checked;*/
        /*}*/
    </style>
</head>

<body>
<form>
    请选择你爱好:<br>
    <input type="checkbox" name="hobby" id="hobby1">  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++){
            var myType=hobby[i].getAttribute("type");
            if(myType=="checkbox"){
                hobby[i].setAttribute("checked","checked");
                //hobby[i].checked=true;
            }else{

            }
        }
        // 任务1

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

    }

    function checkone(){
        clearall();
        var j=document.getElementById("wb").value;
        //console.log("hobby"+j);
        var hobby= document.getElementById("hobby"+j);
        hobby.checked=true;

        // 任务3   在文本框中输入输入1-6数值,当点击"确定"按钮时,根据输入的数值,通过id选中相应的复选项。

    }

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

  

posted @ 2018-03-19 22:45  potato~e-e  阅读(155)  评论(0编辑  收藏  举报