<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;
}
}
// 任务1
}
function clearall(){
var hobby = document.getElementsByName("hobby");
for(i=0;i<=hobby.length;i++){
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
}
</script>
</body>
</html>请问我在任务3里面，输入数字2则选择第二个，但是当我输入5，我上次选择的第二个并不会取消选择，而是继续保持选择状态。怎样才能做到我重新输入一个数字后，上次选择的就自动帮我取消？
1 回答
已采纳
柠檬酸钠
TA贡献331条经验 获得超534个赞
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312-8">
<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;
}
}
// 任务1
}
function clearall(){
var hobby = document.getElementsByName("hobby");
for(i=0;i<=hobby.length;i++){
hobby[i].checked=false;
}
// 任务2
}
function checkone(){
var j=document.getElementById("wb").value;
var hobbys = document.getElementsByName('hobby');
for (var i = 0; i < hobbys.length; i++) {
hobbys[i].checked = false;
}
var hobby = document.getElementById("hobby"+j);
hobby.checked = true;
// 任务3
}
</script>
</body>
</html>遍历所有name为hobby的元素，将checked属性设置为false
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