数据绑定

    <van-field data-name="name" value="{{ detail.name }}" clearable label="姓名" placeholder="请输入姓名（必填）" bind:change="formInputChange" />
  // 表单改变
  formInputChange(e) {
    let key = e.currentTarget.dataset.name
    let {detail} = this.data
    let data = detail
    data[key] = e.detail
    this.setData({
      detail: data
    })
  },