<input type="checkbox" name="cbox">篮球
<input type="checkbox" name="cbox">足球
<input type="checkbox" name="cbox">排球
<input type="checkbox" name="cbox">网球
<input type="checkbox" name="cbox">乒乓球
<br />
<button onclick="switchAll('cbox')">反选</button>
<button onclick="uncheckAll('cbox')">全不选</button>
<script>
function checkAll(cbox) {
var roomids = document.getElementsByName(cbox);
for ( var i = 0; i < roomids.length; i++) {
if (roomids.item(i).checked == false) {
roomids.item(i).checked = true;
}
}
}
function uncheckAll(cbox) {
var roomids = document.getElementsByName(cbox);
for ( var i = 0; i < roomids.length; i++) {
if (roomids.item(i).checked == true) {
roomids.item(i).checked = false;
}
}
}
function switchAll(cbox) {
var roomids = document.getElementsByName(cbox);
for ( var i = 0; i < roomids.length; i++) {
roomids.item(i).checked = !roomids.item(i).checked;
}
}
</script>