移动端如何阻止input框获得焦点时手机键盘的弹出

//html
<input type="password" v-model="scannerMessage"
 ref="scanTextbox" @keyup.13="scannerByUsb" @focus="stopKeyborad">

//js
stopKeyborad () {
  this.$refs.scanTextbox.setAttribute('readonly', 'readonly');
  setTimeout(() => {
    this.$refs.scanTextbox.removeAttribute('readonly');
  }, 200);
}