script

export default {
  filters:{
    mobileFilter(val){
      let reg = /^(.{3}).*(.{4})$/
      return val.replace(reg,'$1****$2')
    }
  },
    data() {
    return {
     mobile:'13451489345'
}
}
}

div

<div>{{mobile | mobileFilter}}</div>

结果：134****9345