请问这段代码如何分析？初学js,不懂，求指教！-慕课网

请问这段代码如何分析？初学js,不懂，求指教！

来源：9-4 区别getElementByID,getElementsByName,getElementsByTagName

慕妹3353997

2017-04-24 14:12

<!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">  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=true;
                
            }
          // 任务1 
           
        }
        function clearall(){
            var hobby = document.getElementsByName("hobby");
            //alert(hobby.length);
            for(var i=0;i<hobby.length;i++){
                hobby[i].checked=false;
            }
         // 任务2    
            
        }
        
        function checkone(){
            clearall();
            var hobby = document.getElementsByName("hobby");
            var j=document.getElementById("wb").value;
            for(var i=0;i<j.length;i++){
                if(j.charAt(i)>6 || j.charAt(i)<1){
                    alert("越界,请重新输入！");
                    document.getElementById("wb").value="";
                }
            }
                for(var n=0;n<j.length;n++){
                   
                        hobby[(j.charAt(n))-1].checked=true; 
                }

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

写回答关注