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样式效果：

代码实现：(纯css，伪类实现)

<div class="item" v-for="i in 3" :key="i" :class="i===1?'selected':''">{{ i }}</div><style>.item {padding: 6px 12px;background-color: #ffffff;border: 1px solid #ddd;width: 40px;margin: 10px;text-align: center;display: inline-block;position: relative;   // 必须有}.selected {border-color: #14BCF5;&:before {        // 三角形背景content: "";position: absolute;right: 0;bottom: 0;border: 10px solid #14BCF5;border-top-color: transparent;border-left-color: transparent;}&:after {        // 对钩content: "";width: 6px;height: 8px;position: absolute;right: 3px;bottom: 3px;border: 1px solid #fff;border-top-color: transparent;border-left-color: transparent;transform: rotate(45deg);}}
</style>