mpvue: css,style表达式

对象语法:

<div :class="{ active: isActive }"></div>

<div
  class="static"
  :class="{ active: isActive, 'text-danger': hasError }"
></div>

数组语法:

<div :class="['defaultClassName', errorClass]"></div>

<div :class="[isActive ? activeClass : '', errorClass]"></div>

<div :class="[{ active: isActive }, errorClass]"></div