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js实现复选框的全选和全不选

2017-08-08 19:27 429 查看
<!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">
//全选
function checkall(){
var hobby = document.getElementsByTagName("input");

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

hobby[i].checked=true;

}

}
//全不选
function clearall(){
var hobby = document.getElementsByName("hobby");

for(var 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>
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