checkbox:全选与反全选

$(document).ready(function () {//全选checkbox$("#selectAll").click(function () {var checked = $(this).prop("checked");$(":checkbox").prop("checked", checked);});$("tbody :checkbox").click(function () {var isAllSelected = $("#selectAll").prop("checked");var selected = $(this).prop("checked");if (!selected ) {$("#selectAll").prop("checked", false);} else {isAllSelected = true;$("tbody :checkbox").each(function () {if (!$(this).prop("checked")) {isAllSelected = false;return false;}});$("#selectAll").prop("checked", isAllSelected);}});});