vant ui 雙向輸入框禁止手機鍵盤彈出

<van-field readOnly  @focus="noBomBox" :formatter="formatterNumber" type="number" @click="show =true" class="field" v-model="fillData"  placeholder="請輸入" />

//禁止手機鍵盤的彈出
noBomBox(Event) {
    document.activeElement.blur();
},