妈妈说好代码要分享-js

//shortcut support. arrow-up arrow-down and enter event.
if (event.which == keyMap.down || event.which == keyMap.up) {
var direction = event.which == keyMap.down ? true : false,
$activeSelector = $('.wcSingleUser.active'),
$tmpSelector;

//if current active selector has next or prev element and direction is matching
//then execute switch active and keep unique
if (((!!($tmpSelector = $activeSelector.next()) && direction)
|| (!!($tmpSelector = $activeSelector.prev()) && !direction))
&& $tmpSelector.length) {
$activeSelector.removeClass('active');
$tmpSelector.addClass('active');
}
return;
}


太美