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<template>
    <button type="button"
            class="btn btn-sm"
            v-bind:class="{'btn-success':followed}"
            v-text="text"
            v-on:click="follow">
    </button>
</template>

要这样:
如果followed为true,class就显示btn-success,
如果followed为false,class就显示btn-secondary。
怎么修改一下?


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:class="followed ? 'btn-success':'btn-secondary'"

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