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<li v-for="(item, index) of chapterArr" :key="index" :class="index + 1 === chapterArr.length ? 'total-item' : 'total-item total-mg'" :style="
background-image: url(${require(@/assets/images/home-bg${index+1}.png
)})" ></li>
${index+1} 两个都会解析AcornNode,
导致sanitizeString方法str非string, 当非string时视为表达式的内容设置为*