解决vue请求接口第一次成功,第二次失败问题

data() {
  return {
    form: {
      old_password: '',
      new_password: '',
      confirm_password: ''
    }
  }
},

this.$http.post('/api/users/modifyPassword', this.form,
  (res) => {
    this.form = {
      old_password: this.form.old_password,
      new_password: this.form.new_password,
      confirm_password: this.form.confirm_password
    }
    if (is.object(res)) {
      console.log(res)
      if (res.code === '0') {
        this.$router.push({ path: '/my/' })
        this.$toast.show(res.msg)
      } else {
        this.$toast.show(res.msg)
      }
    }
  })