三元表达式 标签中 <span class="week">{{ state ? '第一周': "题目" + state }}</span> 标签内 <div :class="state ? 'next' : 'start'" @click="handleClick"></div> <div :class="['start', state ? 'next' : '']" @click="handleClick"></div> 普通表达式 <span class="week" v-show="!state">第一周</span> <span class="week" v-show="state" v-if="state">题目{{ state }}</span>