Buffer.isBuffer(obj)

var b = new Buffer(50);
 
var c = b.toString('base64',0,10);
 
var d = Buffer.isEncoding('base64');
 
var e = Buffer.isBuffer(b);
 
console.log(d);             //返回false
 
console.log(e);             //返回true

// Static methods
Buffer.isBuffer = function isBuffer(b) {
  return util.isBuffer(b);
};