selectAll.change(function() { if(selectAll.is(':checked')){ langs.prop('checked', true); selectAllLabel.text('全不选'); } else { langs.prop('checked', false); selectAllLabel.text('全选'); } })

langs.change(function() { if(langs.filter(':checked').length === langs.length) { selectAll.prop('checked', true); selectAllLabel.text('全不选'); } else { selectAll.prop('checked', false); selectAllLabel.text('全选'); } })

invertSelect.click(function() { langs.each(function() { $(this).prop('checked', !$(this).is(':checked')); }) langs.change(); });