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            function checkall(){
            var hobby = document.getElementsByTagName("input");
            for(var i=0;i<hobby.length;i++){
                if(hobby[i].type=="checkbox"){
                    hobby[i].checked=true;
                }
            }
          // 任务1 
           
        }
        function clearall(){
            var hobby = document.getElementsByName("hobby");
            for(var i=0;i<hobby.length;i++){
                if(hobby[i].type=="checkbox"){
                    hobby[i].checked=false;
                }
            }
         // 任务2    
            
        }
        
        function checkone(){
            var j=document.getElementById("wb").value;
            var hobby = document.getElementById("hobby"+j);
            hobby.checked=true;
         // 任务3
        
        }

Hewitt_Q

2020-04-03

源自：JavaScript进阶篇 9-4

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2 回答

慕村6055097
2020-04-21

<!DOCTYPE HTML>

<html>

<head>

<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

<p>请输入您要选择爱好的序号，序号为1-6:</p>

</form>

function checkall(){

var hobby = document.getElementsByTagName("input");

for(var i = 0; i < hobby.length; i++){

if(hobby[i].name == "hobby"){

hobby[i].checked = true;

}

function clearall(){

var hobby = document.getElementsByName("hobby");

for(var i = 0; i < hobby.length; i++){

if(hobby[i].name == "hobby"){

hobby[i].checked = false;

}

function checkone(){

var j=document.getElementById("wb").value;

var hobby = document.getElementById("hobby" + j);

if(hobby){

hobby.checked = true;

}else{

alert("没有改选项");

}

</script>

</body>

</html>

0 回复有任何疑惑可以回复我~

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万河江
2020-04-17

<!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(i = 0;i < hobby.length;i++){
if(hobby[i].type == "checkbox"){
hobby[i].checked = true; }
  }
}
function clearall(){
var hobby = document.getElementsByName("hobby");
for(i = 0;i < hobby.length;i++){
hobby[i].checked = false;}
}
function checkone(){
var j=document.getElementById("wb").value;
   var hobby = document.getElementById("hobby"+j);
   hobby.checked = true; }
</script>
</body>
</html>