<form >
      <ul>
        <li><p>用戶名</p></li>
        <li><input type="text" name="username" id="username"></li>
      </ul>
      <ul>
        <li><p>密碼</p></li>
        <li><input type="password" name="password" id="password"></li>
      </ul>
      <ul class="mt50">
        <li><input id="login_submit" class="submit" type="button" value="登 陸"></li>
      </ul>
    </form>

$("#login_submit").click(function(){
  var username=$('#username').val();
  var password=$('#password').val();
  //這里實(shí)現(xiàn)對(duì) username和password格式的判斷
  //........
  //發(fā)送ajax請(qǐng)求 使用post方式發(fā)送json字符串給后臺(tái)login
  $.ajax({
    type: "post",
    url: "http://localhost:3000/login",
    dataType: "json",
    data:{ username: username, password: password },
    success: function(data){
    //接受返回的數(shù)據(jù)，前端判斷采取的動(dòng)作
      if(data){
        if(data.message=="false"){
          alert('密碼錯(cuò)誤，請(qǐng)重新輸入');
          window.location.href="login";
        }else{
          alert('登陸成功');
          window.location.href="index";
        }
      } else{
      }
    }
  });
});

/**
 * 注冊(cè)頁 post 
 */
router.post('/reg', function (req, res, next) {
  //先查詢有沒有這個(gè)user
  console.log("req.body"+req.body);
  user2.findDocuments(DATABASE, "users", 1, {"uName":req.body.username}, function (user) {
    res.setHeader('Content-Type', 'application/json;charset=utf-8');
    if(user.length==0){
      //用戶名沒有重復(fù) 同意創(chuàng)建用戶
      user2.insertDocuments(DATABASE, "users",
        [{
          "uName":req.body.username,
          "uPasswd":req.body.password,
          "uEmail":req.body.email,
          "uHasshop":0,
          "uShopname":"null",
          "aId":'-1'

        }],
        function (result){
          res.send({status:"success", message:"true"});
        }
      );
    }
    else{
      // 用戶名重復(fù)。找到這個(gè)user 不同意創(chuàng)建用戶
      res.send({status:"success", message:"false"});
    }
  });
});