解决vue js IOS H5focus无法自动弹出键盘的问题

<template>
 <div class="pwdpush-box">
  <h4 class="enter-password" @click="enterPwd">输入密码</h4>
  <div class="phonenum-show" :class="pushShow?'':'write-phonenum-1000'">
   <div class="write-phonenum">
    <p @click.prevent="pushShow = false">使用余额支付 8864</p>
    <p>支付密码：</p>
    <ul class="write-input clearfix">
     <input type="tel" ref="input" maxlength="6" class="realInput" v-model="realInput" autofocus @keyup="getNum()" v-focus @keydown="delNum()">
     <li v-for="disInput in disInputs"><input type="tel" maxlength="1" disabled v-model="disInput.value"></li>
    </ul>
    <mt-button size="large" style="margin-top:80px;" @click="goPay">确认支付</mt-button>
   </div>
  </div>
 </div>
</template>

<script>
import { Field,Toast ,Indicator} from 'mint-ui';
import {headerNav,bottomShow} from '../../vuex/actions/actionDoc'
export default {
 name: 'packe',
 vuex: {
  actions:{
   headerNav,
   bottomShow
  }
 },
 data(){
  return{
   messagepacket:false,
   packets:[

   ],
   disInputs:[{value:''},{value:''},{value:''},{value:''},{value:''},{value:''}],
   realInput:'',
   pushShow:false

  }
 },
 mounted(){
  this.headerNav(false)
  this.bottomShow(false)
 },
 methods:{
  getNum(){
   for(var i=0;i<this.realInput.length;i++){
    this.disInputs[i].value=this.realInput.charAt(i)
    // 表示字符串中某个位置的数字，即字符在字符串中的下标。
   }
  },
  delNum(){
   var oEvent = window.event;
   if (oEvent.keyCode == 8) {
    if(this.realInput.length>0){
     this.disInputs[this.realInput.length-1].value=''
    }
   }
  },
  goPay(){
    console.log(this.realInput)
  },
  enterPwd(){
    this.pushShow = true;
    this.$refs.input.focus()
  }
 }
}
</script>
<style lang="less" sconed>
 .enter-password{
  text-align: right;
  color:#1D890D;
  font-size: 18px;
  line-height: 2;
  margin-top:20px;
  padding-right: 20px;
 }
 .phonenum-show{
  background: rgba(0,0,0,0.6);
  position: absolute;
  top:0;
  right:0;
  bottom:0;
  left:0;
  z-index: -1;
 }
 .getback-title span{position: absolute;right:0;top:3px;width:15px;height:15px;display: inline-block;}
 .write-phonenum-1000{
  top:-1000px!important;
 }
 .write-phonenum{
  position: absolute;
  top:50%;
  margin-top:-100px;
  left:0;
  right:0;
  bottom:0;
  z-index: 2;
  padding:30px 10px 0;
  background: #fff;
 }
 .write-phonenum p{
  font-size: 14px;
  margin-left:30px;
  line-height:2;
 }
 .write-phonenum p span{color: #3b90d1;}
 .write-input {width:312px; margin:10px auto; position: relative;}
 .write-input li{float: left;width:30px;height:30px; margin: 0 10px; border:1px solid #888888;}
 .write-input li input{-webkit-appearance: none;-moz-appearance: none;-ms-appearance: none;resize: none;outline: none;border:0;width:30px;line-height: 30px;text-align: center;height: 30px;font-size:16px;}
 .write-phonenum .mint-button--default{background: #3b90d1;color:#fff;font-family: "微软雅黑";font-size: 14px;width:80%;margin:10px auto;}
 .realInput{
  /* Keyword values */
  -webkit-appearance: none;
  -moz-appearance: none;
  -ms-appearance: none;
  resize: none;
  outline: none;
  border: 0;
  z-index: 3;
  position: absolute;
  width: 290px;
  height: 30px;
  line-height: 30px;
  background: none;
  display: block;
  left: 50%;
  margin-left: -145px;
  top: 34px;
  opacity: 0;
  font-size: 0px;
  caret-color: #fff;
  color: #000;
  text-indent: -5em;
  font-size: 30px;
  top:1px;
 }
 input[type="tel"]:disabled{background-color: #fff;}
</style>