使用三元运算符

<text >{{(topic.tab=="ask")?"问答":((topic.tab=="share")?"分享":"招聘")}}</text>

 <span>{{cart.total == 0 ? "购物车是空的" :" ￥"+ cart.total}}</span>

style="{{cart.count>0 ? 'background:#30c0fc' : 'background:#58401f'}}"

class="{{cart.total==0 ? 'total-empty-pick-up' : 'total-settlement'}}"