ajax提交的问题困惑我已晚上，各种方法都试了可就死拿不到参数值，用的是express4.x，代码如下

<div class="form-group">
          <label for="exampleInputEmail1">邮箱</label>
          <input type="email" class="form-control" id="exampleInputEmail1" name="email" placeholder="Email">
        </div>
        <div class="form-group">
          <label for="exampleInputPassword1">密码</label>
          <input type="password" class="form-control" id="exampleInputPassword1" name="pwd" placeholder="Password">
        </div>

<script>
  jQuery(document).ready(function() {
    $("#form_submit").bind("click",function(){
      var email = $("#exampleInputEmail1").val();
      var pwd = $("#exampleInputPassword1").val();
        console.log(email);
        $.ajax({
            url:'/loginverificat',
            type:'post',
            contentType:"application/json",
            data: JSON.stringify({email:email,pwd:pwd}),
            success: function(data){
              console.log(data);
            },
            error: function(data,status){
                console.log("error");
            }
        });
    });
  });

后台

var express = require("express");
var app = express();
app.use(express.static(__dirname +"/public"));
app.post("/loginverificat",function(req,res){
    console.log(JSON.stringify(req.body.email));
    //  console.log(JSON.stringify(req.ip));
    console.log(JSON.stringify(req.params));
    console.log(JSON.stringify(req.query));
});
app.get("/login",function(req,res){
    res.sendFile(ablotePath+"login.html");
});
app.listen(8888);
console.log("lissten port 8888")

刚开始接触node.js，希望有这方面的经验朋友帮忙解释下这个问题