<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="checkbox" name="ids" value="吃饭">吃饭
<input type="checkbox" name="ids" value="睡觉">睡觉
<input type="checkbox" name="ids" value="打豆豆">打豆豆<br>
<input type="button" id="qx" value="全选" οnclick="qx()">
<input type="button" id="fx" value="反选" οnclick="fx()">
<input type="button" id="qbx" value="全不选" οnclick="qbx()">
</body>
</html>
<script>
function qx(){
var ids=document.getElementsByName("ids");
for(var i=0;i<ids.length;i++){
ids[i].checked=true;
}
}
/**
* function qx()
* {
* var ids=document.getElementsByName("ids");
* for(var i=0;i<ids.length;i++)
* {
* ids[i].checked=true/false/
* ids[i].checked=!ids[i].checked
* }
* }
* */
function qbx(){
var ids=document.getElementsByName("ids");
for(var i=0;i<ids.length;i++){
ids[i].checked=false;
}
}
function fx(){
var ids=document.getElementsByName("ids");
for(var i=0;i<ids.length;i++){
ids[i].checked=!ids[i].checked;
}
}
</script>
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