vue动态设置class
//动态class对象
<div :class="{ 'isActive': true, 'blue': isBlue}"></div>
<div :class="{ active: isActive }"></div>
//动态class数组
<div :class="['is-active', isBlue ? 'blue' : '' ]"></div>
vue动态设置style
//动态style对象
<div :style="{ color: color, fontSize: '12px' }"></div>
//动态style数组
<div :style="[{ color: color, fontSize: '12px' }, { textAlign: 'center' }]"></div>
