看不懂这段。。。。。
function checkone(){
var j=document.getElementById("wb").value;
var hobby = document.getElementById("hobby"+j);
hobby.checked = true; }
qq_精慕门3321009
2020-03-08
6 回答
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<titlntsByName,getElementsBe>无标题文档</title>
</head>
<body>
<form>
请选择你爱好:<br>
<input type="checkbox" name="hobby" id="hobby1"> 1音乐
<input type="checkbox" name="hobby" id="hobby2"> 2登山
<input type="checkbox" name="hobby" id="hobby3"> 3游泳
<input type="checkbox" name="hobby" id="hobby4"> 4阅读
<input type="checkbox" name="hobby" id="hobby5"> 5打球
<input type="checkbox" name="hobby" id="hobby6"> 6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");
// 任务1
for(var i=0;i<hobby.length;i++)
{
if(hobby[i].type == "checkbox")
{
hobby[i].checked = true;
}
}
}
function clearall(){
var hobby = document.getElementsByName("hobby");
// 任务2
for(var i=0;i<hobby.length;i++)
{
hobby[i].checked = false;
}
}
function checkone(){
var j=document.getElementById("wb").value;
// 任务3
var hobby = document.getElementById("hobby"+j);
hobby.checked = true;
}
</script>
</body>
</html>
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