text: //Buffer 类似于数组
  //Buffer 里面只能放自己 0-255
  //指定大小
  var buffer = new Buffer(1);
  buffer[0] = 10;
  console.log(buffer);
  
  //通过字符串来创建
  console.log(new Buffer('crystal'));
  
  //通过数组来创建
  console.log(new Buffer([1,2,3]));