上传多张图片时，如何做到监听每一张图片的上传进度。 运行代码时 upload.onProgressUpdate 这个方法在循环中只能调用一遍。求解！！ js代码： chooseImage:function(){ var that=this wx.chooseImage({ count: 5, sizeType: ['original','compressed'], sourceType: ['album'], success: function(res) { console.log(res) console.log(res.tempFilePaths.length) for (var i = 0; i < res.tempFilePaths.length;i++){ var up = wx.uploadFile({ url: '', filePath: res.tempFilePaths[i], name: 'file', success: function (res) { console.log(res) console.log('上传完毕啦') } }) up.onProgressUpdate((res) => { console.log('监听进度') that.setData({ percent: res.progress }) console.log('上传进度', res.progress) console.log('已经上传的数据长度', res.totalBytesSent) console.log('预期需要上传的数据总长度', res.totalBytesExpectedToSend) }) } }, fail: function(res) {}, complete: function(res) {}, }) },