//axml
<input class="internet_input" value="{{payNo}}" onInput="keyNum" controlled={{true}} type="text"  />

//js
keyNum(e) {
    e.detail.value=e.detail.value.replace(/[\u4e00-\u9fa5]/ig, ‘‘)
      this.setData({
        payNo:e.detail.value
    })
 }