/**
  * 上传照片//选择图片时限制9张，如需超过9张，同理亦可参照此方法上传多张照片
  */
uploadImg:function(){
   var that = this;
   wx.chooseImage({
       count: 9,
           sizeType: ['original', 'compressed'],
           sourceType: ['album', 'camera'],
           success: function(res){
               var successUp = 0; //成功
               var failUp = 0; //失败
               var length = res.tempFilePaths.length; //总数
               var count = 0; //第几张
              that.uploadOneByOne(res.tempFilePaths,successUp,failUp,count,length);
           },        
   });
},

/**
  * 采用递归的方式上传多张
  */
 uploadOneByOne(imgPaths,successUp, failUp, count, length){
   var that = this;
   wx.showLoading({
      title: '正在上传第'+count+'张',
    })
   wx.uploadFile({
     url: 'https://example.weixin.qq.com/upload', //仅为示例，非真实的接口地址
     filePath: imgPaths[count],
     name: count,//示例，使用顺序给文件命名
     success:function(e){
       successUp++;//成功+1
     },
     fail:function(e){
       failUp++;//失败+1
     },
     complete:function(e){
       count++;//下一张
       if(count == length){
         //上传完毕，作一下提示
         console.log('上传成功' + successUp + ',' + '失败' + failUp);
         wx.showToast({
           title: '上传成功' + successUp + '张',
           icon: 'success',
           duration: 2000
         })
       }else{
         //递归调用，上传下一张
         that.uploadOneByOne(imgPaths, successUp, failUp, count, length);
         console.log('正在上传第' + count + '张');
       }
     }
   })
 }