lodop插件如何把base64格式（编码）打印输出图片

var LODOP; //声明为全局变量 
function myPreview() {	
  LODOP = getLodop();             
  var strBASE64Code = 'base64编码';
  LODOP.PRINT_INIT("");
  LODOP.ADD_PRINT_IMAGE(100,100,"100%","100%",strBASE64Code);
  LODOP.PREVIEW(); //打印预览
};

function myDesign() {	
  LODOP = getLodop();             
  var strBASE64Code = 'base64编码';
  LODOP.PRINT_INIT("");
  LODOP.ADD_PRINT_SETUP_BKIMG(strBASE64Code);
  LODOP.ADD_PRINT_TEXT(22,30,193,28,"这是正常内容,后面是背景图");
  LODOP.PRINT_DESIGN();	
};