JavaScript仿小米官网注册登录功能的实现

首先我们需要搭建好页面布局

html的代码如下：


<div class="contentrightbottom">
                <div class="contentrightbottombox">
 
                    <div class="crbottomlogin">
                        <div class="login"><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >登录</a></div>
                        <div class="regist"><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >注册</a></div>
                    </div>
                    <div class="loginregistbox">
                        <ul>
                            <li>
                                <div class="crbottomcontent">
                                    <input type="text" placeholder="邮箱/手机号码/小米ID" class="user">
                                    <br>
                                    <p class="pzh">请输入账号</p>
                                    <div class="pwdeyebox">
                                        <input type="password" placeholder="密码" class="pwd"><br>
                                        <img src="close.png" alt="" class="eye">
                                    </div>
                                    <p class="pmm">请输入密码</p>
                                    <input type="checkbox" class="checks">
                                    <span>已阅读并同意小米账号</span>
                                    <span>用户协议</span>
                                    <span>和</span>
                                    <span>隐私政策</span><br>
                                    <button>登录</button><br>
                                    <span class="forgetpwd"><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >忘记密码？</a></span>
                                    <span class=" phonelogin"><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >手机号登录</a></span>
                                    <p class="other">其他登录方式</p>
                                    <div class="crbottomcontentimg">
                                        <span><img src="share1.png" alt=""></span>
                                        <span><img src="share2.png" alt=""></span>
                                        <span><img src="share3.png" alt=""></span>
                                        <span><img src="share4.png" alt=""></span>
                                    </div>
                                </div>
                            </li>
                            <li>
                                <div class="crbottomcontentregist">
                                    <input type="text" placeholder="请输入注册账号" class="ruser">
                                    <p class="rpzh">请输入账号</p>
                                    <br>
                                    <input type="password" placeholder="请输入密码" class="rpwd">
                                    <p class="rpmm">请输入密码</p><br>
                                    <input type="number" class="rphone" placeholder="短信验证码">
                                    <p class="rpyzm">请输入验证码</p><br>
                                    <input type="checkbox" class="checks">
                                    <span>已阅读并同意小米账号</span>
                                    <span>用户协议</span>
                                    <span>和</span>
                                    <span>隐私政策</span><br>
                                    <button>登录</button><br>
                                    <span class="forgetpwd"><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >忘记密码？</a></span>
                                    <span class=" phonelogin"><a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >手机号登录</a></span>
                                    <p class="other">其他登录方式</p>
                                    <div class="crbottomcontentimg">
                                        <span><img src="share1.png" alt=""></span>
                                        <span><img src="share2.png" alt=""></span>
                                        <span><img src="share3.png" alt=""></span>
                                        <span><img src="share4.png" alt=""></span>
                                    </div>
                                </div>
                            </li>
                        </ul>
                    </div>
 
                </div>
                <p class="conpany">小米公司版权所有-京ICP备10046444-京公网安备11010802020134号</p>
            </div>

整个登录注册分为上下两个盒子：

上面的盒子装登录和注册两个文字盒子，作为JS的点击滑动按钮

下面的盒子使用小li分别装登录和注册两个盒子，然后让小li浮动起来，让登录注册两个盒子浮动在一行，然后给contentrightbottombox这个大盒子添加overfl:hidden属性，超出的隐藏起来之后我们就可以写JS功能代码了

JavaScript仿小米官网注册登录功能的实现

JS功能1

点击登录注册进行切换

JavaScript仿小米官网注册登录功能的实现

在css里面我们通过小li的浮动将登录和注册的盒子浮动在一排

当我们点击注册按钮的时候只需要让包裹小li的ul移动到注册盒子上面即可

当我们点击登录按钮的时候也只需要让ul移动到登录的盒子上面

代码如下：

  var registbtn = document.querySelector('.regist');
    var loginbtn = document.querySelector('.login'); 
    var loginregistbox = document.querySelector('.loginregistbox');
    var boxul = loginregistbox.querySelector('ul');
 
    registbtn.addEventListener('click', function () {
        boxul.style.transition = 'all 0.3s';
        boxul.style.transform = 'translateX(-414px)';
        registbtn.style.borderBottom = '4px solid #FF6900';
        loginbtn.style.borderBottom = 'none';
 
    });
    loginbtn.addEventListener('click', function () {
        boxul.style.transition = 'all 0.3s';
        boxul.style.transform = 'translateX(0px)';
        loginbtn.style.borderBottom = '4px solid #FF6900';
        registbtn.style.borderBottom = 'none';
 
    });

JS功能2

点击input盒子里面的文字缩小并往上移动

JavaScript仿小米官网注册登录功能的实现

在小米官网的登录里面，它是使用lable标签来实现，我是直接给input里面的placeholder添加样式来实现

修改placeholder的样式我们是通过伪类的方式实现，并且给它定位让它缩小后移动到要求的位置，并且加上了过渡，看起来好看一点点

代码如下：

 
    var user = document.querySelector('.user');
    var pwd = document.querySelector('.pwd');
    var pzh = document.querySelector('.pzh');
    var pmm = document.querySelector('.pmm');
 
    user.addEventListener('focus', function () {
        user.style.border = '1px solid red';
        user.style.boxShadow = '0 0 1px 2px #FFDECC';
        user.style.backgroundColor = '#FCF2F3';
        user.style.transition = 'all 0.3s';
        user.setAttribute('class', 'user change1');
 
    });

.change1::placeholder{
 position: absolute;
 top: 5px;
 left: 20px;
 font-size: 12px;
color: #C1C1C1;
transition: all .3s;
    
}
.change2::placeholder{
   font-size: 17px;
       color: red;
       transition: all .3s;
   }

JS功能3

跳出提示”请输入账号”

JavaScript仿小米官网注册登录功能的实现

在html添加一个p标签(其他标签也可以)，在css里面修改他的样式并给它display样式让他隐藏起来

在js里面失去焦点的时候判断文本框里面是否有值，有值就让他隐藏，否则就显示

代码如下：

user.addEventListener('blur', function () {
 
        user.style.border = 'none';
        user.style.boxShadow = 'none';
        user.style.transition = 'all .3s';
        if (user.value == '') {
            pzh.style.display = 'block';
            user.style.backgroundColor = '#FCF2F3';
            user.setAttribute('class', 'user change2');
        } else {
            pzh.style.display = 'none';
            user.style.backgroundColor = '#F9F9F9';
            user.style.fontSize = '17px';
 
            user.setAttribute('class', 'user change1');
        }
    });

.rpzh,.rpmm,.rpyzm{
    display: none;
    color: red;
    font-size: 12px;
    margin-top: 10px;
    margin-left: 40px;
    margin-bottom: -30px;
}

JS功能4

显示密码和隐藏密码

JavaScript仿小米官网注册登录功能的实现

定义一个flag变量来控制开关图片的切换和input中的type属性中的值

  var flag = 0;
    eyes.addEventListener('click', function () {
        if (flag == 0) {
            pwd.type = 'text';
            eyes.src = 'open.png';
            flag = 1;
        }
        else {
            pwd.type = 'password';
            eyes.src = 'close.png';
            flag = 0;
        }
    });

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