<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();  //這里實現對 username和password格式的判斷  //........  //發送ajax請求 使用post方式發送json字符串給后臺login  $.ajax({    type: "post",    url: "http://localhost:3000/login",    dataType: "json",    data:{ username: username, password: password },    success: function(data){    //接受返回的數據，前端判斷采取的動作      if(data){        if(data.message=="false"){          alert('密碼錯誤，請重新輸入');          window.location.href="login";        }else{          alert('登陸成功');          window.location.href="index";        }      } else{      }    }  });});

/** * 注冊頁 post  */router.post('/reg', function (req, res, next) {  //先查詢有沒有這個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 同意創建用戶      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。找到這個user 不同意創建用戶      res.send({status:"success", message:"false"});    }  });});