1.图片上传

<view class="sectionImg">
      <view class="section__title">二寸红底照片</view>
      <image class='section__img' data-id="imgOne" src='{{imgOne ? imgOne : plusImg}}' bindtap='chooseImage'></image>
      <input type='text' hidden='true' name="imgOne" value='{{imgOneValue}}'/>
      <view hidden='{{imgOneStatus}}' class='imgStatus'>{{imgOneTip}}</view>
    </view>

• src中imgOne代表现在的变量，plusImg代表原来的变量，原理是用现在的变量代替原来的变量；
• input中value值中imgOneValue变量代表服务器端接收到的地址；
• js代码

Page({
  data: {
    plusImg: '/image/plus.png',
    imgOne: '',
  },
  //上传图片
  chooseImage: function (e) {
    // 初始化七牛配置
    initQiniu();

    var imgId = e.currentTarget.dataset.id;
    var that = this;
    wx.chooseImage({
      count: 1,
      sizeType: ['original', 'compressed'], 
      sourceType: ['album', 'camera'], 
      success: function (res) {
        // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
        var tempFilePaths = res.tempFilePaths
        console.log(tempFilePaths)
      
        // 交给七牛上传
        qiniuUploader.upload(tempFilePaths[0], (upRes) => {
          // console.log(upRes);
          // 修改数据
          var data = {};
          data[imgId] = tempFilePaths;
          var imgValue = imgId+'Value';
          data[imgValue] = upRes.imageURL;
          that.setData(data);
        }, (error) => {
        }
        );
      }
    })
  },

• hidden中的imgOneStatus变量和imgOneTip变量是表单验证时的字段
• 表单验证提交代码

/**
 * 设置验证字段
 */
function setValidate(obj) {
  obj.WxValidate = app.WxValidate(
    {
      level: {
        required: true
      },
      name: {
        required: true
      },
      imgOne: {
        required: true
      },
    }, {
      level: {
        required: '请选择报考等级'
      },
      name: {
        required: '请输入您的姓名'
      },
      imgOne: {
        required: '请上传二寸红底照片'
      },
    }
  );
}
// 提交表单
  formSubmit: function (e) {
    console.log('form发生了submit事件，携带数据为：', e.detail.value)
    var that = this
    var meInfo = this.data.userInfo;
    var requestValue = e.detail.value;
    var formId = e.detail.formId;
    // console.log(e);

    // 去掉提示
    var data = {};
    for (var i in requestValue) {
      var status = i + 'Status';
      data[status] = true;
    }
    this.setData(data);

    //提交错误描述
    if (!this.WxValidate.checkForm(e)) {
      data = {};
      var errs = this.WxValidate.errorList;
      for (var i in errs) {
        var tip = errs[i].param + 'Tip';
        var status = errs[i].param + 'Status';
        var msg = errs[i].msg;

        data[tip] = msg;
        data[status] = false;
      }
      console.log(data);
      this.setData(data);
      return false
    }
  }

2.在js中必须初始化app；var app = getApp();

3.一定要记得引入文件

const config = require("../../config");
const qiniuUploader = require("../../utils/qiniuUploader");