爲什麼多個類選擇器不能使用removeClass

Question

如何使用多個類在一個語句中完成這項工作？

<div class="ddd back7">d</div> 
<div class="fff back7">f</div> 
<div class="ggg back7">g</div> 

$('.ddd','.fff','.ggg').removeClass('back7'); //Does not work 


$('.ddd').removeClass('back7');//Does 
$('.fff').removeClass('back7');//Does 
$('.ggg').removeClass('back7');//Does 

http://jsfiddle.net/qfmgcvkk/

Answer 1

要在引號中的逗號：

$('.ddd, .fff, .ggg').removeClass('back7');