HTML+CSS3+JavaScript实现注册登陆表单验证 序 用原生js实现表单验证登陆，这样大家会更好的懂代码，轻松使用。转载代码的博有留下一个，这样我会继续 发送跟多炫酷的表单登陆，供给你大家使用，并且实用性比较强。 作者：https://home.cnblogs.com/u/yangslin/ 欢迎大家互关，给新人一点信心 一：实现图 1.登陆页面： 
2.注册页面 
二：登陆代码以及注册代码 1.login.html代码如下： <!DOCTYPE html> <html lang=”en”> <head> <meta charset=”UTF-8″> <title>log-in</title> <link rel=”stylesheet” href=”https://www.cnblogs.com/yangslin/p/css/login.css”> </head> <body> <header> <div class=”header-line”></div> </header> <div class=”content”> <img class=”content-logo” src=”https://www.cnblogs.com/yangslin/p/img/hello.png” alt=”logo”> <h1 class=”content-title”>登录</h1> <div class=”content-form”> <form method=”post” action=”” onsubmit=”return submitTest()”> <div id=”change_margin_1″> <input class=”user” type=”text” name=”user” placeholder=”请输入用户名” onblur=”oBlur_1()” onfocus=”oFocus_1()”> </div> <!– input的value为空时弹出提醒 –> <p id=”remind_1″></p> <div id=”change_margin_2″> <input class=”password” type=”password” name=”password” placeholder=”请输入密码” onblur=”oBlur_2()” onfocus=”oFocus_2()”> </div> <!– input的value为空时弹出提醒 –> <p id=”remind_2″></p> <div id=”change_margin_3″> <input class=”content-form-signup” type=”submit” value=”登录”> </div> </form> </div> <div class=”content-login-description”>没有账户？</div> <div><a class=”content-login-link” href=”https://www.cnblogs.com/yangslin/p/sgin.html”>注册</a></div> </div> <script src=”https://www.cnblogs.com/yangslin/p/js/login_sgin.js”></script> </body> </html> 2.sgin.html代码如下： <!DOCTYPE html> <html lang=”en”> <head> <meta charset=”UTF-8″> <title>sign-up</title> <link rel=”stylesheet” href=”https://www.cnblogs.com/yangslin/p/css/login.css”> </head> <body> <header> <div class=”header-line”></div> </header> <div class=”content”> <img class=”content-logo” src=”https://www.cnblogs.com/yangslin/p/img/hello.png” alt=”logo”> <h1 class=”content-title”>创建账户</h1> <div class=”content-form”> <form method=”post” action=”” onsubmit=”return submitTest()”> <div id=”change_margin_1″> <input class=”user” type=”text” name=”user” placeholder=”请输入用户名” onblur=”oBlur_1()” onfocus=”oFocus_1()”> </div> <!– input的value为空时弹出提醒 –> <p id=”remind_1″></p> <div id=”change_margin_2″> <input class=”password” type=”password” name=”password” placeholder=”请输入密码” onblur=”oBlur_2()” onfocus=”oFocus_2()”> </div> <!– input的value为空时弹出提醒 –> <p id=”remind_2″></p> <div id=”change_margin_3″> <input class=”content-form-signup” type=”submit” value=”创建账户”> </div> </form> </div> <div class=”content-login-description”>已经拥有账户？</div> <div><a class=”content-login-link” href=”https://www.cnblogs.com/yangslin/p/log_in.html”>登录</a></div> </div> <script src=”https://www.cnblogs.com/yangslin/p/js/login_sgin.jss”></script> </body> </html> 3.login以及sgin的CSS3样式代码如下： /*重置样式*/ html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub , sup, tt, var, b, u, i, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, section, summary, time, mark, audio, video { margin: 0; padding: 0; border: 0 } body { font-family: “微软雅黑”; background: #f4f4f4; } /*header*/ .header-line { width: 100%; height: 4px; background: #0dbfdd; } /*content*/ .content { width: 28%; margin: 70px auto 0; text-align: center; } .content-logo { width: 80px; height: 80px; } .content-title { margin: 10px 0 25px 0; font-size: 2em; color: #747474; font-weight: normal; } .content-form { width: 100%; padding: 36px 0 20px; border: 1px solid #dedede; text-align: center; background: #fff; } .content-form form div { margin-bottom: 19px; } .content-form form .user, .content-form form .password { width: 77%; height: 20px; padding: 10px; font-size: 1em; border: 1px solid #cccbcb; border-radius: 7px; letter-spacing: 1px; } .content-form form input:focus { outline: none; -webkit-box-shadow: 0 0 5px #0dbfdd; box-shadow: 0 0 5px #0dbfdd; } .content-form-signup { width: 84%; margin: 0 auto; padding: 10px; border: 1px solid #cccbcb; border-radius: 7px; font-size: 1em; font-weight: bold; color: #fff; background: #0dbfdd; cursor: pointer; } .content-form-signup:hover { background: #0cb3d0; } .content-form-signup:focus { outline: none; border: 1px solid #0cb3d0; } .content-login-description { margin-top: 25px; line-height: 1.63636364; color: #747474; font-size: .91666667rem; } .content-login-link { font-size: 16px; color: #0dbfdd; text-decoration: none; } /*输入框无内容便提示*/ #remind_1, #remind_2 { width: 76%; margin: 0 auto 2px; text-align: left; font-size: .2em; color: #f00; } 4.login和sgin用js实现： // 全局变量a和b，分别用户框和密码框的value值 var a = document.getElementsByTagName(“input”)[0].value; var b = document.getElementsByTagName(“input”)[1].value; //用户框失去焦点后验证value值 function oBlur_1() { if (!a) { //用户框value值为空 document.getElementById(“remind_1”).innerHTML = “请输入用户名！”; document.getElementById(“change_margin_1”).style.marginBottom = 1 + “px”; } else { //用户框value值不为空 document.getElementById(“remind_1”).innerHTML = “”; document.getElementById(“change_margin_1”).style.marginBottom = 19 + “px”; } } //密码框失去焦点后验证value值 function oBlur_2() { if (!b) { //密码框value值为空 document.getElementById(“remind_2”).innerHTML = “请输入密码！”; document.getElementById(“change_margin_2”).style.marginBottom = 1 + “px”; document.getElementById(“change_margin_3”).style.marginTop = 2 + “px”; } else { //密码框value值不为空 document.getElementById(“remind_2”).innerHTML = “”; document.getElementById(“change_margin_2”).style.marginBottom = 19 + “px”; document.getElementById(“change_margin_3”).style.marginTop = 19 + “px”; } } //用户框获得焦点的隐藏提醒 function oFocus_1() { document.getElementById(“remind_1”).innerHTML = “”; document.getElementById(“change_margin_1”).style.marginBottom = 19 + “px”; } //密码框获得焦点的隐藏提醒 function oFocus_2() { document.getElementById(“remind_2”).innerHTML = “”; document.getElementById(“change_margin_2”).style.marginBottom = 19 + “px”; document.getElementById(“change_margin_3”).style.marginTop = 19 + “px”; } //若输入框为空，阻止表单的提交 function submitTest() { if (!a && !b) { //用户框value值和密码框value值都为空 document.getElementById(“remind_1”).innerHTML = “请输入用户名！”; document.getElementById(“change_margin_1”).style.marginBottom = 1 + “px”; document.getElementById(“remind_2”).innerHTML = “请输入密码！”; document.getElementById(“change_margin_2”).style.marginBottom = 1 + “px”; document.getElementById(“change_margin_3”).style.marginTop = 2 + “px”; return false; //只有返回true表单才会提交 } else if (!a) { //用户框value值为空 document.getElementById(“remind_1”).innerHTML = “请输入用户名！”; document.getElementById(“change_margin_1”).style.marginBottom = 1 + “px”; return false; } else if (!b) { //密码框value值为空 document.getElementById(“remind_2”).innerHTML = “请输入密码！”; document.getElementById(“change_margin_2”).style.marginBottom = 1 + “px”; document.getElementById(“change_margin_3”).style.marginTop = 2 + “px”; return false; } } 三：登陆注册的logo图片 
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