wx.getImageInfo({

          src: "http://usr/1617938703084share.jpg"",

success: function(res) {

            let img = res.path;

            // 把需要画出来的图片的临时url暴露出去

            resolve(img);

            reject();

          },

          fail(e){

            console.log('读取图片报错');

            console.log(e);

          },

fail回调方法中报这个错getImageInfo:fail invalid