text: 
  var mongoose =require("mongoose");
  
  var  Schema=  mongoose.Schema;
  
  
  var obj = {
  	author:String,
  	title:String,
  	content:String,
  	pathname:String
  }
  
  var model = mongoose.model("article",new Schema(obj));
  //model 这个对象，映射的是articles  这张表
  
  module.exports = model;
  