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Generate qr code for string data
This is a node.js wrapper for the qrcode JavaScript library (http://www.d-project.com/qrcode)
npm install qrcode-js
var qrcode=require('qrcode-js');
var url = 'http://www.sunzhongkui.me';
var base64 = qrcode.toDataURL(url, 4);修复 url 过长导致生成二维码出错的BUG