<a-input 
　　v-model.trim="form.card" 
　　placeholder="请输入卡号或直接打卡" 
　　style="width:50%" 
　　allowClear 
　　@keyup="form.card = onlyNumber(form.card)" 
　　@afterpaste="form.card = onlyNumber(form.card)" 
　　@input="form.card = onlyNumber(form.card)" 
/>

onlyNumber(value){
     return value.replace(/[^\d]/g,'')
},