Nodejs - 如何在视图中显示qr-image结果

Question

我使用qr-imageNodejs插件生成QR码,效果非常好.

问题是在ejs中显示结果图像.

var express = require('express');
var router = express.Router();
var qr = require('qr-image');

router.get('/', function(req, res) {
    var code = qr.image("text to show in qr", { type: 'png', ec_level: 'H', size: 10, margin: 0 });
    res.type('png');
    code.pipe(res);
    // res.render('index', { title: 'QR Page', qr: code });
});

当我取消注释最后一行时,nodejs崩溃.如何将code视图作为变量发送？

更新:

此代码[object Object]在结果页面中返回.

var code = qr.image("text to show in qr", { type: 'png', ec_level: 'H', size: 10, margin: 0 });
res.render('index', { title: 'QR Page', qr: code });

console.log(代码)也显示了这个:

{ _readableState:
   { highWaterMark: 16384,
     buffer: [],
     length: 0,
     pipes: null,
     pipesCount: 0,
     flowing: false,
     ended: false,
     endEmitted: false,
     reading: false,
     calledRead: false,
     sync: true,
     needReadable: false,
     emittedReadable: false,
     readableListening: false,
     objectMode: false,
     defaultEncoding: 'utf8',
     ranOut: false,
     awaitDrain: 0,
     readingMore: false,
     decoder: null,
     encoding: null },
  readable: true,
  domain: null,
  _events: {},
  _maxListeners: 10,
  _read: [Function] }

Answer 1

您正在尝试将渲染图像填充到模板引擎中; 它不会起作用.

您应该在模板中有一个图像标记,指向一个响应图像的URL.

//根据评论进行编辑

router.get('/qr/:text', function(req,res){
   var code = qr.image(req.params.text, { type: 'png', ec_level: 'H', size: 10, margin: 0 });
   res.setHeader('Content-type', 'image/png');
   code.pipe(res);
}

然后在你的html模板中,创建一个src设置为的图像标记,/qr/whatever text你应该处于良好的状态.