<div>
<input type="checkbox">
<input disabled>
<input disabled>
<input disabled>
</div>
<div>
<input type="checkbox">
<input disabled>
<input disabled>
<input disabled>
</div>
<script>
window.onload = function () {//onload begin
document.body.onclick = function (e) {//onclick begin
e = e || event;
var target = e.target || e.srcElement;
if (target.type == 'checkbox') {
var inp = target.parentNode.children;
var len = inp.length;
if (target.checked == true) {
for (var i = 1; i < len; i++) {
inp[i].disabled = false;
}
} else {
for (var i = 1; i < len; i++) {
inp[i].disabled = true;
}
}
}
}//onclick end
}//onload end
</script>