getLocalImgData为什么在循环中未执行回调方法?
发布于 5 年前 作者 xietao 4448 次浏览 来自 官方Issues

调用JSSDK上传图片,上传单独文件时并未有异常,在多图上传时发现getLocalImgData未报错,并在开发者工具中控制台成功打印获取到的数据,但是回调方法并未执行。

this.$wx.ready(function() {
  that.$wx.chooseImage({
    count: 9 - that.imgList.length,
    sizeType: ["compressed"],
    sourceType: ["album", "camera"],
    success: function(res) {
      let localIds = res.localIds; // 返回选定照片的本地ID列表,localId可以作为img标签的src属性显示图片
      that.loading.uploadLength = localIds.length;
      window.console.log("累计上传", localIds);
      // 分批上传图片
      for (var i = 0; i < localIds.length; i++) {
        window.console.log("即将", i);
        that.$wx.getLocalImgData({
          localId: localIds[i], // 图片的localID
          success: function(res) {
            window.console.log("开始上传", res);
            // that.doUploadImage(res.localData);
          },
          fail: function(err) {
            window.console.error(err);
            that.loading.show = false;
          }
        });
      }
    },
    fail: function() {
      that.loading.show = false;
    },
    cancel: function() {
      that.loading.show = false;
    }
  });

单独上传控制台打印如下:

多图上传控制台打印如下:

在多图打印执行后在使用getLocalImgData中的打印并未执行。

2 回复

问题可能是我使用vue的原因

借鉴问题:https://segmentfault.com/q/1010000019080941

调整代码后成功:

uploadImage() {
  var that = this;
  // this.loading.show = true;
  this.$wx.ready(function() {
    that.$wx.chooseImage({
      count: 9 - that.imgList.length,
      sizeType: ["compressed"],
      sourceType: ["album", "camera"],
      success: function(res) {
        let localIds = res.localIds; // 返回选定照片的本地ID列表,localId可以作为img标签的src属性显示图片
        that.readImages(localIds);
      },
      fail: function() {
        that.loading.show = false;
      },
      cancel: function() {
        that.loading.show = false;
      }
    });
  });
},
async readImages(localIds) {
  for (var i = 0; i < localIds.length; i++) {
    await this.doreadImage(localIds[i]);
  }
},
doreadImage(item) {
  let that = this;
  return new Promise(resolve => {
    that.$wx.getLocalImgData({
      localId: item,
      success: function(res) {
        let localData = res.localData;
        window.console.log(localData);
        resolve("done!");
      },
      fail: function(err) {
        window.console.error(err);
      }
    });
  });
},

this.$wx.ready(function() {

that.$wx.chooseImage({

count: 9 - that.imgList.length,

sizeType: [“compressed”],

sourceType: [“album”, “camera”],

success: function(res) {

let localIds = res.localIds; // 返回选定照片的本地ID列表,localId可以作为img标签的src属性显示图片

that.loading.uploadLength = localIds.length;

window.console.log(“累计上传”, localIds);

let tasks = [];

// 分批上传图片

for (var i = 0; i < localIds.length; i++) {

window.console.log(“即将”, i);

let p = new Promise((resolve, reject) => {

that.$wx.getLocalImgData({

localId: localIds[i], // 图片的localID

success: function(res) {

resolve(res)

window.console.log(“开始上传”, res);

// that.doUploadImage(res.localData);

},

fail: function(err) {

reject(err)

window.console.error(err);

that.loading.show = false;

}

});

})

tasks.push(p)

}

Promise.all(tasks).then(res => {

console.log(res, ‘循环输出结果’)

})

},

fail: function() {

that.loading.show = false;

},

cancel: function() {

that.loading.show = false;

}

});

})

复制运行一下

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