完整代码

1 sign_up.html 注册表单

创建账户



已经拥有账户？
登录

2 log_in.html 登录表单

登录



没有账户？
注册

3 common_form.css 表单css样式

/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 common_form_test.js 注册登录脚本

// 全局变量a和b，分别获取用户框和密码框的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;
}
}

到这里，一个简单的注册登录页面就完成了，后面会持续更新，使之更强大