html checkbox全选或者全不选

/* 全选或全不选 */
function CheckedAllOrNo() {
var arr = $(':checkbox');
for (var i = 1; i < arr.length; i++) {
arr[i].checked = arr[0].checked;
}
}

$(":checkbox").click(function(){
$(":checkbox").each(function() {
this.checked = false;
});
this.checked = true;
});