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javascript实现全选/取消全选，反选/取消反选

2016-01-05 15:19 731 查看

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>全选/取消全选，反选/取消反选</title>
</head>
<body>
</p>
<p><input type="checkbox" id="selectAll">全选/取消全选<input type="checkbox" id="investselect">反选/取消反选</p>
<p>
<input type="checkbox" name="checkmost">
<input type="checkbox" name="checkmost">
<input type="checkbox" name="checkmost">
<input type="checkbox" name="checkmost">
<input type="checkbox" name="checkmost">
<input type="checkbox" name="checkmost">

</p>
<script>
window.onload=function(){
var targets=document.getElementsByName("checkmost"),
selectAll=document.getElementById("selectAll"),
investselect=document.getElementById("investselect");
selectAll.onclick=function(){
loop(targets,"all",this);
}
investselect.onclick=function(){
loop(targets,"invest",this);
}
}
function loop(objs,flag,that){
var select=null;
for(var i= 0,length=objs.length;i<length;i++){
switch(flag) {
case "all": select=that.checked; break;
case "invest": select=!objs[i].checked; break;
}
objs[i].checked=select;
}
}
</script>
</body>
</html>

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