ajax登錄請求第一次點擊按鈕沒有發出post請求，但后臺卻能接收到數據，且登錄驗證流程全都沒能生效，第二次提交的時候才能正常post，登錄驗證流程流程也生效登錄頁面的ajax代碼<script> ???????$("#login_botton").click(function(){ ???????????//注冊按鈕的事件，用ajax提交表單 ???????????$.post("/dologin",{ ???????????????"username"?:?$("#username").val(), ???????????????"password"?:?$("#password").val() ??????},function(result){ ???????????????if(result?==?"1"){ ???????????????????//登錄成功 ???????????????????alert("登陸成功！將自動跳轉到首頁"); ???????????????????window.location?=?"/"; ???????????????}else?if(result?==?"-1"){ ???????????????????$("#regist-msg").html("用戶名不存在"); ???????????????????$("#regist-msg").addClass("alert-danger") ???????????????}else?if(result?==?"-2"){ ???????????????????$("#regist-msg").html("密碼錯誤！"); ???????????????????$("#regist-msg").addClass("alert-danger") ???????????????} ???????????}); ???????}); </script>這是登錄驗證的代碼var?formidable?=?require("formidable");var?es6?=?require("es6");var?path?=?require("path");var?fs?=?require("fs");var?db?=?require("./db.js");var?md5?=?require("./md5"); exports.doLogin?=?function?(req,?res,?next)?{????//得到用戶表單 ???var?form?=?new?formidable.IncomingForm(); ???form.parse(req,?function?(err,?fields,?files)?{????????//得到表單之后做的事情 ???????var?username?=?fields.username;????????var?password?=?fields.password;????????console.log(username+password);????????var?jiamihou?=?md5(password);????????//查詢數據庫，看看有沒有個這個人 ???????db.find("users",?{"username":?username},?function?(err,?result)?{????????????if?(err)?{ ???????????????res.send("-5");????????????????return; ???????????}????????????//沒有這個人 ???????????if?(result.length?==?0)?{ ???????????????res.send("-1");?//用戶名不存在 ???????????????return; ???????????}????????????//有的話，進一步看看這個人的密碼是否匹配 ???????????if?(jiamihou?==?result[0].password)?{ ???????????????req.session.login?=?"1"; ???????????????req.session.username?=?username; ???????????????res.send("1");??//登陸成功 ???????????????return; ???????????}?else?{ ???????????????res.send("-2");??//密碼錯誤 ???????????????return; ???????????} ???????}); ???}); };這是入口文件var?express?=?require('express');var?app?=?express();var?ejs?=?require('ejs');var?route?=?require('./route/route');var?myDo?=?require('./model/do');var?session?=?require('express-session');//使用sessionapp.use(session({ ???secret:?'keyboard?cat', ???resave:?false, ???saveUninitialized:?true})); app.set('view?engine','ejs');//靜態文件app.use('/static',express.static('public')); app.use("/avatar",express.static("./avatar")); app.get('/login',route.showLogin); app.post('/dologin',myDo.doLogin);當我第一次點擊登錄的時候，從控制臺看到沒有post請求，但后臺卻打印出了賬號和密碼，同一個頁面不刷新，我第二次點登錄的時候，控制臺就有post請求了，而且賬號驗證的代碼也能正常運行