text-to-db64 (npm): ```  npm install text-to-db64  ```  #### to use it  ```  // 目前做了Helvetica, yahei两种字体的垂直居中调整  // defaultConfig  var config = {      width: 80,      height: 80,      bgColor: '#000',      color: '#fff',      fontSize: 30,      fontFamily: 'Helvetica',      
Keywords: canvas|database64|image|text