1、背景描述，有个公司内部用的小系统，不想大动干戈用太多前端框架，就用HTML5写了个登陆页面，刚开始想着用form表单提交登陆账户信息。后来因为前后端分离，并且统一用ajax调用后台服务交互数据，因此在form表单提交的方法中加了ajax异步调用后台服务验证登陆信息。
2、问题，在登陆功能测试时，偶尔出现点登陆按钮后，页面跳转并重新加载后无反应(控制台没有报错,后台服务正常)，前端ajax调用成功后方法打了断点也没进入，再点登陆按钮几次又能正常登陆。
3、解决，经过测试为form表单提交并刷新页面后，ajax异步请求结果还没有接收到，导致ajax调用成功后方法没有执行。所以能感觉到页面刷新了一下(因为URL后面多了个"？"号)，但没有登陆成功，也没有报错。最后去掉form表单问题解决。
登陆失败多了个"?"号
修改正确后代码：
<!DOCTYPE html>
<html lang="zh">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon" />
<link rel="icon" sizes="any" mask href="favicon.ico">
<title>登陆页面</title>
<style>
*{
margin:0;
padding:0;
}
body{
margin:0 auto;
background-color:#E7FBFA;
}
#loginDiv{
margin:0 auto;
background-color:#E7FBFA;
background-size:1024px 567px;
min-width:824px;
min-height:600px;
}
#divForm, form{
margin:0 auto;
/* display:block; */
/* border:1px solid #303a40; */
/* padding: 200px 0 0 390px; */
min-width:434px;
min-height:400px;
}
ul{
margin:40px auto 10px auto;
}
li{
list-style:none;
height:30px;
text-align: center;
margin-bottom:10px;
}
li span{
display: block;
color:#ff6633;
font-size: 12px;
}
.error-border{
border:1px solid #ff6633;
}
.success-border{
border:1px solid #BBB;/*2eff37*/
}
.username, .password{
padding:0 0 0 10px;
color:#666;
width:200px;
height: 30px;
/* border:1px solid #BBB; */
}
.username:focus, .password:focus {
outline: none;
border-color: #4488F9;
}
::-webkit-input-placeholder { /* WebKit, Blink, Edge */ color: #BBB; font-size:14px}
:-moz-placeholder { /* Mozilla Firefox 4 to 18 */ color: #BBB; font-size:14px}
::-moz-placeholder { /* Mozilla Firefox 19+ */ color: #BBB; font-size:14px}
:-ms-input-placeholder { /* Internet Explorer 10-11 */ color: #BBB; font-size:14px}
.saveAccounts{
margin:0 auto;
padding:0;
width:200px;
height: 16px;
font-size: 12px;
color:#BBB;
}
.saveAccounts input[type=checkbox] {
cursor: pointer;
position: relative;
border:1px solid #BBB;
background-color:rgba(0,0,0,0);
color:#BBB;
height: 16px;
padding:0;
margin:0;
vertical-align:top;
}
.saveAccounts input[type=checkbox]::after {
position: absolute;
top: 0;
background-color: #fff;
color: #fff;
width: 14px;
height: 14px;
display: inline-block;
visibility: visible;
padding-left: 0px;
text-align: center;
content: ' ';
border-radius: 2px;
box-sizing: border-box;
border: 1px solid #ddd;
}
.saveAccounts input[type=checkbox]:checked::after {
content: "";
background-color: #037DF3;
border-color: #037DF3;
background-color: #037DF3;
}
.saveAccounts input[type=checkbox]:checked::before {
content: '';
position: absolute;
top: 1px;
left: 5px;
width: 3px;
height: 8px;
border: solid white;
border-width: 0 2px 2px 0;
transform: rotate(45deg);
z-index: 1;
}
.loginTips{
margin:0 auto;
width:200px;
height: 25px;
color:#ff0000;
}
.submit{
margin:0 auto;
width:200px;
height: 25px;
text-align: center;
background-color: #0066FF;
padding:17px 0 0 0;
}
.submit input{
color:#fff;
font-size:14px;
border-style:none;
margin:0 auto;
width: 200px;
height: 25px;
text-align: center;
background-color:rgba(0,0,0,0);
}
</style>
</head>
<body>
<div id="loginDiv">
<!-- <form action=""> -->
<div id="divForm">
<ul class='logging'>
<li>
<input class="username success-border" type="text" placeholder="请输入帐号" onfocus="focusFun(this)" onblur="blurFun(this)" maxlength="11">
</li>
<li>
<input class="password success-border" type="password" placeholder="请输入密码">
</li>
</ul>
<div class="saveAccounts">
<input type="checkbox" id="saveInput" title="记住密码" checked="checked" onClick="saveCook()"/> 记住密码
</div>
<div class="loginTips">
<span class="loginTipsSpan"></span>
</div>
<div class="submit">
<input id="submit" type="submit" value="登 录">
</div>
</div>
<!-- </form> -->
</div>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
var request_url = 'http://127.0.0.1:8009/test';
function getCookie(cname)
{
var name = cname + "=";
var ca = document.cookie.split(';');
for(var i=0; i<ca.length; i++)
{
var c = ca[i].trim();
if (c.indexOf(name)==0) return c.substring(name.length,c.length);
}
return "";
}
function setCookie(cname,cvalue,exdays){
var d = new Date();
d.setTime(d.getTime()+(exdays*24*60*60*1000));
var expires = "expires="+d.toGMTString();
document.cookie = cname+"="+cvalue+"; "+expires;
}
//请求数据
function httpRequestData(url,inSendData,callBack)
{
//创建一个 XMLHTTPRequest 类型对象
var xhr = null;
if (window.XMLHttpRequest) {//标准浏览器
xhr = new window.XMLHttpRequest;
} else {//IE浏览器
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
xhr.onreadystatechange = success;
//open()方法开启请求
xhr.open("POST", url, true); //请求的类型GET POST; true异步（默认） false同步
//post请求要自己设置请求头
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");//发送表单数据
//xhr.setRequestHeader("Content-type", "application/json"); //发送json格式数据
//xhr.setRequestHeader("Content-type","application/json;charset=utf-8"); //发送json格式数据
//xhr.setRequestHeader("Content-type", "text/plain;charset=utf-8");发送纯文本
//xhr.setRequestHeader("Content-type", "text/html;charset=utf-8");发送html文本
//xhr.send(JSON.stringify(inSendData).replace(/\s+/g,""));
//xhr.send(JSON.stringify(inSendData));
xhr.send(inSendData);
//xhr.send(null);
function success() {
if (xhr.readyState == 4) { //回传成功
if(xhr.status == 200){
//console.info(xhr.responseText);
console.log('network success.');
callBack(xhr);
//return true;
}
else{
console.log("Problem retrieving XML data");
//return true;
}
}
//else {
// console.log('network error.');
// return false;
//}
}
}
function focusFun(point){
//触发焦点，若输入的值跟默认值一样，输入的值为空
if(point.defaultValue == point.value){
point.value = '';
}
}
function blurFun(point){
//失去焦点时，若值为空，则值等于默认值，也就是placeholder
if(point.value == ''){
point.value = point.defaultValue;
}
}
function saveCook(){
//取消记住密码，则删除
if(!document.getElementById("saveInput").checked){
// 删除cookie
setCookie('un', '', 0);
setCookie('pw', '', 0);
}
setCookie('cc', document.getElementById("saveInput").checked, 365);
}
function checkLogin(un,pwd) {
//var sendData = "{'login':'"+un+"','pass':'"+pwd+"'}";
var sendData = "login="+un+"&pass="+pwd;
httpRequestData(request_url + '/login/getUserInfo',sendData,addInfo);
};
function submitForm(){
if(document.getElementById("saveInput").checked){
setCookie('un', $('.username').val(),365);
setCookie('pw', $('.password').val(),365);
}
setCookie('cc', document.getElementById("saveInput").checked,365);
checkLogin($('.username').val(),$('.password').val());
}
function addInfo(xhr){
var returnVaule = $.parseJSON(xhr.responseText);
console.log(returnVaule);
if(returnVaule.code===0){
if(returnVaule.hasOwnProperty("data")){
if(returnVaule.data===""){
$('.loginTipsSpan').html('登陆失败!输入用户名或密码错误!!!');
}
else{
setCookie('loginState', '1', 365);
setCookie('uname', returnVaule.data.name, 365);
console.log('登陆成功！');
window.location.href = "main.html";
}
}
else{
$('.loginTipsSpan').html('登陆失败!输入用户名或密码错误!!!');
}
}
else{
$('.loginTipsSpan').html('登陆失败!输入用户名或密码错误!!!');
}
}
$(function(){
//若验证正确，则为true,最后判断是否能提交
var isPwd = false
var isUser = false;
$(document).ready(function(){
var user = getCookie("un");
var pwd = getCookie("pw");
var cc = getCookie("cc");
// 判断是否存在cookie
if (user) {
$('.username').val(user);
isPwd = true;
$('.password').val(pwd);
isUser = true;
}
if (cc=='false') {
document.getElementById("saveInput").checked = "";
}
else {
document.getElementById("saveInput").checked = "checked";
}
})
$('.username').blur(function(){
//正则表达式，验证用户名
//用户名要1开头，第二位是3或4或5或6，最后一位以8或9结束，一共要11位
//reg=/^1[3|4|5|6][0-9]\d{8,9}$/i;
if($(this).val() == '' || $(this).val() == '请输入您的账号'){
$('.username').addClass('error-border');
$('.loginTipsSpan').html('账户不能为空!!!');
$(this).removeClass('success-border');
isPwd = false;
}
//else if($('.username').val().length < 11){
// $('.loginTipsSpan').html('长度错误!!!');
// $('.username').addClass('error-border');
//}
//else if(!reg.test($('.username').val())){
// $('.loginTipsSpan').html('账户不存在!!!');
// $('.username').addClass('error-border');
//}
else{
$('.username').removeClass('error-border');
$('.username').addClass('success-border');
$('.loginTipsSpan').html('');
isUser = true;
}
});
$('.password').blur(function(){
//密码要a-z(大小写),1-9，总共6-22位
//正则可以先了解
//reg=/^[\@A-Za-z0-9\!\#\$\%\^\&\*\.\~]{6,22}$/;
if($(this).val() == ''){
$(this).addClass('error-border');
$('.loginTipsSpan').html('密码不能为空!!!');
$(this).removeClass('success-border');
isPwd = false;
}
//else if(!reg.test($(this).val())){
// $(this).addClass('error-border');
// $('.loginTipsSpan').html('密码格式不对!!!');
//}
else
{
$(this).addClass('success-border');
$(this).removeClass('error-border');
$('.loginTipsSpan').html('');
isPwd = true;
}
});
//$('form').submit(function(){
$('#submit').click(function(){
$('.loginTipsSpan').html('');
//用户名密码验证通过则提交，验证不通过不提交
if(isPwd && isUser){
submitForm();
//alert('提交成功！')
//return true;
}else{
if(!($('.username').val() == '' || $('.username').val() == '请输入您的账号')&&($('.password').val() != '')){
submitForm();
}
else{
$('.loginTipsSpan').html('用户名或密码不能为空!!!');
setCookie('cc', document.getElementById("saveInput").checked,365);
//return false;
}
}
})
})
</script>
</body>
</html>?有问题代码：
<!DOCTYPE html>
<html lang="zh">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon" />
<link rel="icon" sizes="any" mask href="favicon.ico">
<title>登陆页面</title>
<style>
*{
margin:0;
padding:0;
}
body{
margin:0 auto;
background-color:#E7FBFA;
}
#loginDiv{
margin:0 auto;
background-color:#E7FBFA;
background-size:1024px 567px;
min-width:824px;
min-height:600px;
}
form{
margin:0 auto;
/* display:block; */
/* border:1px solid #303a40; */
/* padding: 200px 0 0 390px; */
min-width:434px;
min-height:400px;
}
ul{
margin:40px auto 10px auto;
}
li{
list-style:none;
height:30px;
text-align: center;
margin-bottom:10px;
}
li span{
display: block;
color:#ff6633;
font-size: 12px;
}
.error-border{
border:1px solid #ff6633;
}
.success-border{
border:1px solid #BBB;/*2eff37*/
}
.username, .password{
padding:0 0 0 10px;
color:#666;
width:200px;
height: 30px;
/* border:1px solid #BBB; */
}
.username:focus, .password:focus {
outline: none;
border-color: #4488F9;
}
::-webkit-input-placeholder { /* WebKit, Blink, Edge */ color: #BBB; font-size:14px}
:-moz-placeholder { /* Mozilla Firefox 4 to 18 */ color: #BBB; font-size:14px}
::-moz-placeholder { /* Mozilla Firefox 19+ */ color: #BBB; font-size:14px}
:-ms-input-placeholder { /* Internet Explorer 10-11 */ color: #BBB; font-size:14px}
.saveAccounts{
margin:0 auto;
padding:0;
width:200px;
height: 16px;
font-size: 12px;
color:#BBB;
}
.saveAccounts input[type=checkbox] {
cursor: pointer;
position: relative;
border:1px solid #BBB;
background-color:rgba(0,0,0,0);
color:#BBB;
height: 16px;
padding:0;
margin:0;
vertical-align:top;
}
.saveAccounts input[type=checkbox]::after {
position: absolute;
top: 0;
background-color: #fff;
color: #fff;
width: 14px;
height: 14px;
display: inline-block;
visibility: visible;
padding-left: 0px;
text-align: center;
content: ' ';
border-radius: 2px;
box-sizing: border-box;
border: 1px solid #ddd;
}
.saveAccounts input[type=checkbox]:checked::after {
content: "";
background-color: #037DF3;
border-color: #037DF3;
background-color: #037DF3;
}
.saveAccounts input[type=checkbox]:checked::before {
content: '';
position: absolute;
top: 1px;
left: 5px;
width: 3px;
height: 8px;
border: solid white;
border-width: 0 2px 2px 0;
transform: rotate(45deg);
z-index: 1;
}
.loginTips{
margin:0 auto;
width:200px;
height: 25px;
color:#ff0000;
}
.submit{
margin:0 auto;
width:200px;
height: 25px;
text-align: center;
background-color: #0066FF;
padding:17px 0 0 0;
}
.submit input{
color:#fff;
font-size:14px;
border-style:none;
margin:0 auto;
width: 200px;
height: 25px;
text-align: center;
background-color:rgba(0,0,0,0);
}
</style>
</head>
<body>
<div id="loginDiv">
<form action="">
<ul class='logging'>
<li>
<input class="username success-border" type="text" placeholder="请输入帐号" onfocus="focusFun(this)" onblur="blurFun(this)" maxlength="11">
</li>
<li>
<input class="password success-border" type="password" placeholder="请输入密码">
</li>
</ul>
<div class="saveAccounts">
<input type="checkbox" id="saveInput" title="记住密码" checked="checked" onClick="saveCook()"/> 记住密码
</div>
<div class="loginTips">
<span class="loginTipsSpan"></span>
</div>
<div class="submit">
<input id="submit" type="submit" value="登 录">
</div>
</form>
</div>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
var request_url = 'http://127.0.0.1:8009/test';
function getCookie(cname)
{
var name = cname + "=";
var ca = document.cookie.split(';');
for(var i=0; i<ca.length; i++)
{
var c = ca[i].trim();
if (c.indexOf(name)==0) return c.substring(name.length,c.length);
}
return "";
}
function setCookie(cname,cvalue,exdays){
var d = new Date();
d.setTime(d.getTime()+(exdays*24*60*60*1000));
var expires = "expires="+d.toGMTString();
document.cookie = cname+"="+cvalue+"; "+expires;
}
//请求数据
function httpRequestData(url,inSendData,callBack)
{
//创建一个 XMLHTTPRequest 类型对象
var xhr = null;
if (window.XMLHttpRequest) {//标准浏览器
xhr = new window.XMLHttpRequest;
} else {//IE浏览器
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
xhr.onreadystatechange = success;
//open()方法开启请求
xhr.open("POST", url, true); //请求的类型GET POST; true异步（默认） false同步
//post请求要自己设置请求头
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");//发送表单数据
//xhr.setRequestHeader("Content-type", "application/json"); //发送json格式数据
//xhr.setRequestHeader("Content-type","application/json;charset=utf-8"); //发送json格式数据
//xhr.setRequestHeader("Content-type", "text/plain;charset=utf-8");发送纯文本
//xhr.setRequestHeader("Content-type", "text/html;charset=utf-8");发送html文本
//xhr.send(JSON.stringify(inSendData).replace(/\s+/g,""));
//xhr.send(JSON.stringify(inSendData));
xhr.send(inSendData);
//xhr.send(null);
function success() {
if (xhr.readyState == 4) { //回传成功
if(xhr.status == 200){
//console.info(xhr.responseText);
console.log('network success.');
callBack(xhr);
//return true;
}
else{
console.log("Problem retrieving XML data");
//return true;
}
}
//else {
// console.log('network error.');
// return false;
//}
}
}
function focusFun(point){
//触发焦点，若输入的值跟默认值一样，输入的值为空
if(point.defaultValue == point.value){
point.value = '';
}
}
function blurFun(point){
//失去焦点时，若值为空，则值等于默认值，也就是placeholder
if(point.value == ''){
point.value = point.defaultValue;
}
}
function saveCook(){
//取消记住密码，则删除
if(!document.getElementById("saveInput").checked){
// 删除cookie
setCookie('un', '', 0);
setCookie('pw', '', 0);
}
setCookie('cc', document.getElementById("saveInput").checked, 365);
}
function checkLogin(un,pwd) {
//var sendData = "{'login':'"+un+"','pass':'"+pwd+"'}";
var sendData = "login="+un+"&pass="+pwd;
httpRequestData(request_url + '/login/getUserInfo',sendData,addInfo);
};
function submitForm(){
if(document.getElementById("saveInput").checked){
setCookie('un', $('.username').val(),365);
setCookie('pw', $('.password').val(),365);
}
setCookie('cc', document.getElementById("saveInput").checked,365);
checkLogin($('.username').val(),$('.password').val());
}
function addInfo(xhr){
var returnVaule = $.parseJSON(xhr.responseText);
console.log(returnVaule);
if(returnVaule.code===0){
if(returnVaule.hasOwnProperty("data")){
if(returnVaule.data===""){
$('.loginTipsSpan').html('登陆失败!输入用户名或密码错误!!!');
}
else{
setCookie('loginState', '1', 365);
setCookie('uname', returnVaule.data.name, 365);
console.log('登陆成功！');
window.location.href = "main.html";
}
}
else{
$('.loginTipsSpan').html('登陆失败!输入用户名或密码错误!!!');
}
}
else{
$('.loginTipsSpan').html('登陆失败!输入用户名或密码错误!!!');
}
}
$(function(){
//若验证正确，则为true,最后判断是否能提交
var isPwd = false
var isUser = false;
$(document).ready(function(){
var user = getCookie("un");
var pwd = getCookie("pw");
var cc = getCookie("cc");
// 判断是否存在cookie
if (user) {
$('.username').val(user);
isPwd = true;
$('.password').val(pwd);
isUser = true;
}
if (cc=='false') {
document.getElementById("saveInput").checked = "";
}
else {
document.getElementById("saveInput").checked = "checked";
}
})
$('.username').blur(function(){
//正则表达式，验证用户名
//用户名要1开头，第二位是3或4或5或6，最后一位以8或9结束，一共要11位
//reg=/^1[3|4|5|6][0-9]\d{8,9}$/i;
if($(this).val() == '' || $(this).val() == '请输入您的账号'){
$('.username').addClass('error-border');
$('.loginTipsSpan').html('账户不能为空!!!');
$(this).removeClass('success-border');
isPwd = false;
}
//else if($('.username').val().length < 11){
// $('.loginTipsSpan').html('长度错误!!!');
// $('.username').addClass('error-border');
//}
//else if(!reg.test($('.username').val())){
// $('.loginTipsSpan').html('账户不存在!!!');
// $('.username').addClass('error-border');
//}
else{
$('.username').removeClass('error-border');
$('.username').addClass('success-border');
$('.loginTipsSpan').html('');
isUser = true;
}
});
$('.password').blur(function(){
//密码要a-z(大小写),1-9，总共6-22位
//正则可以先了解
//reg=/^[\@A-Za-z0-9\!\#\$\%\^\&\*\.\~]{6,22}$/;
if($(this).val() == ''){
$(this).addClass('error-border');
$('.loginTipsSpan').html('密码不能为空!!!');
$(this).removeClass('success-border');
isPwd = false;
}
//else if(!reg.test($(this).val())){
// $(this).addClass('error-border');
// $('.loginTipsSpan').html('密码格式不对!!!');
//}
else
{
$(this).addClass('success-border');
$(this).removeClass('error-border');
$('.loginTipsSpan').html('');
isPwd = true;
}
});
$('form').submit(function(){
$('.loginTipsSpan').html('');
//用户名密码验证通过则提交，验证不通过不提交
if(isPwd && isUser){
submitForm();
//alert('提交成功！')
//return true;
}else{
if(!($('.username').val() == '' || $('.username').val() == '请输入您的账号')&&($('.password').val() != '')){
submitForm();
}
else{
$('.loginTipsSpan').html('用户名或密码不能为空!!!');
setCookie('cc', document.getElementById("saveInput").checked,365);
//return false;
}
}
})
})
</script>
</body>
</html>