const uploadTask = uni.uploadFile({  
    url: aaa, //开发者服务器 url  
    filePath: filePath, //要上传文件资源的路径  
    name: 'file', //必须填file  

})  
uploadTask.onProgressUpdate((res) => {  
    this.updata = res  
    // console.log(res.totalBytesSent + '/' + res.totalBytesExpectedToSend)  
    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);  
	//回调中打印一下时间戳
	let a = res.totalBytesSent  
    let b = res.totalBytesExpectedToSend  
    that.per = ((a / b) * 100).toFixed(0)  
    console.log("per  " + that.per + "time  " + new Date().toLocaleString())
});