<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf8">
<title>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">
var hobby1 = document.getElementsByName("hobby");
function checkall(){
var hobby = document.getElementsByTagName("input");
// 任务1
for(i=0;hobby.length>i;i++){
hobby[i].checked=true;
}
}
function clearall(){
// 任务2
for(i=0;hobby1.length>i;i++){
hobby1[i].checked=false;
}
}
function checkone(){
var j=document.getElementById("wb").value;
if(parseInt(j)<=6 & parseInt(j)>=1){
hobby1[j-1].checked="true";
}
// 任务3
else {
alert("请输入正确的序号！！（1~6）");
document.getElementById("wb").value=null;
}
}
</script>
</body>
</html>
