value: expected ＜String＞ but get null value. Use empty string instead.(anonymous) @ rodents.js?=1；:

微信小程序使用vant-weapp组件库出现的bug：

property "value" of "miniprogram_npm/@vant/weapp/field/index" received type-uncompatible value: expected <String> but get null value. Use empty string instead.

原因是未在js/data下定义value：""

如：

wxml：

<van-field
  value="{{ experiment }}"
  clearable
  label="试验名称/编号"
  placeholder="请输入试验名称/编号(选填)"
  bind:click-icon="onClickIcon"
/>

js:

data: {
    experiment : '',
  },