node 解析图片二维码的内容代码实例

const {readFile, readFileSync} = require('fs');const decodeImage = require('jimp').read;const qrcodeReader = require('qrcode-reader');const path = require("path");var p = path.resolve(__dirname,"data/qrcode2.jpg"); readFile(p,function(err,fileBuffer){  if(err){    throw new Error(err);    return ;  }   decodeImage(fileBuffer,function(err,image){    if(err){      throw new Error(err);      return ;    }    let decodeQR = new qrcodeReader();    decodeQR.callback = function(errorWhenDecodeQR, result) {      if (errorWhenDecodeQR) {        throw new Error(errorWhenDecodeQR)        return;      }      if (!result){        console.log("gone with wind");      }else{        console.log(result.result); //结果      }           };        decodeQR.decode(image.bitmap);        });  })