<el-button v-for="(item,index) in mTod" :key="index" :class="[{'rmb':index === 0}, {'dollar':index === 1},{'active':index === idx}]" @click="currencyConverter(index)">{{item}}</el-button>
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<el-button v-for="(item,index) in mTod" :key="index" :class="[{'rmb':index === 0}, {'dollar':index === 1},{'active':index === idx}]" @click="currencyConverter(index)">{{item}}</el-button>
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