3分钟写出来的Jquery版checkbox全选反选功能

//反选
function selectnoALL() {
$("input:checkbox").each(function (i) {
if (this.checked) {
this.checked = false;
} else {
this.checked = true;
}
});
}
//全选
function selectALL() {
var chelength = $("input:checkbox").length;
$("input:checkbox").each(function (i) {
if (i < chelength - 2) {
this.checked = true;
}
});
}