用Vue写了一个前端的登录页面

<template>
  <div class="backContent">
    <div class="loginContent">
        <h3>登录</h3>
        <div class="loginSelect">
            <ul>
                <a href="#">
                    <i style="margin-left: 10px;font-style: normal;">账号密码登录</i>
                </a>
                <i style="padding: 32px;font-style: normal;">|</i>
                <a href="#">
                    <i style="font-style: normal;">扫描二维码登录</i>
                </a>
            </ul>
        </div>
      <el-form
        class="loginStyle"
        :model="loginForm"
        :rules="rules"
        ref="loginForm"
      >
        <div class="accountStyle">
            <el-form-item prop="userAccount">
                <el-input prefix-icon ="el-icon-user"
                    v-model="loginForm.userAccount"
                    type="input"
                    placeholder="请输入你的账号">
                </el-input>
            </el-form-item>     
        </div>

        <div class="pwdStyle">
        <el-form-item prop="userPassword">
          <el-input prefix-icon="el-icon-unlock"
            v-model="loginForm.userPassword"
            type="password" show-password
            placeholder="请输入你的密码">
          </el-input>
        </el-form-item>
        </div>

    <div class="drag" ref="dragDiv">
        <div class="drag_bg"></div>
        <div class="drag_text">{{confirmWords}}</div><!-- 文本的变化-->
        <div ref="moveDiv" @mousedown="mousedownFn($event)" :class="{'handler_ok_bg':confirmSuccess}" 
            class="handler handler_bg" style="position: absolute;top: 0px;left: 0px;"></div>
    </div>

        <!-- <img :src="captchaUrl" @click="updateCaptcha"> -->

        <el-checkbox v-model="checked" class="rememberLogin">记住密码</el-checkbox>
        <div>
            <el-button style="width:320px;" type="primary">点击登录</el-button>
        </div>

        <el-divider content-position="left" style="width:10px;padding-top:2px">第三方验证登录</el-divider>

        <div>
            <ul>
                <a href="#">
                    <i style="margin-left: 10px;font-style: normal;">账号密码登录</i>
                </a>
                <i style="padding: 32px;font-style: normal;">|</i>
                <a href="#">
                    <i style="font-style: normal;">扫描二维码登录</i>
                </a>
            </ul>
        </div>

      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      loginForm: {
        userAccount: "admin",
        userPassword: "admin",
        
      },
      rules: {
        userAccount: [
          { required: true, message: "账号不能为空", trigger: "blur" },
        ],
        userPassword: [
          { required: true, message: "密码不能为空", trigger: "change" },
        ],
      },
    //   登录验证码
        beginClientX:0,           /*距离屏幕左端距离*/
        mouseMoveStata:false,     /*触发拖动状态  判断*/
        maxwidth:'',               /*拖动最大宽度，依据滑块宽度算出来的*/
        confirmWords:'拖动滑块验证',   /*滑块文字*/
        confirmSuccess:false          /*验证成功判断*/
    };
  },
  methods: {
    mousedownFn:function (e) {
        if(!this.confirmSuccess){
            e.preventDefault && e.preventDefault();   //阻止文字选中等 浏览器默认事件
            this.mouseMoveStata = true;
            this.beginClientX = e.clientX;
        }
    },        //mousedoen 事件

    successFunction(){
        this.confirmSuccess = true
        this.confirmWords = '验证通过';
        if(window.addEventListener){
                document.getElementsByTagName('html')[0].removeEventListener('mousemove',this.mouseMoveFn);
                document.getElementsByTagName('html')[0].removeEventListener('mouseup',this.moseUpFn);
        }else {
            document.getElementsByTagName('html')[0].removeEventListener('mouseup',()=>{});
        }
            document.getElementsByClassName('drag_text')[0].style.color = '#fff'
            document.getElementsByClassName('handler')[0].style.left = this.maxwidth + 'px';
            document.getElementsByClassName('drag_bg')[0].style.width = this.maxwidth + 'px';
        },                //验证成功函数

        mouseMoveFn(e){
            if(this.mouseMoveStata){
                let width = e.clientX - this.beginClientX;
                if(width>0 && width<=this.maxwidth){
                    document.getElementsByClassName('handler')[0].style.left = width + 'px';
                    document.getElementsByClassName('drag_bg')[0].style.width = width + 'px';
                }else if(width>this.maxwidth){
                    this.successFunction();
                }
            }
        },                   //mousemove事件

        moseUpFn(e){
            this.mouseMoveStata = false;
            var width = e.clientX - this.beginClientX;
            if(width<this.maxwidth){
                document.getElementsByClassName('handler')[0].style.left = 0 + 'px';
                document.getElementsByClassName('drag_bg')[0].style.width = 0 + 'px';
            }
        },
    },                      //mouseup事件

    mounted(){
        this.maxwidth = this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth;
        document.getElementsByTagName('html')[0].addEventListener('mousemove',this.mouseMoveFn);
        document.getElementsByTagName('html')[0].addEventListener('mouseup',this.moseUpFn)
    }
}
</script>
<style>
.backContent {
  background-image: url("../assets/backg.png");
  position:fixed;
  top: 0;
  left: 0;
  width:100%;
  height:100%;
  min-width: 1000px;
  z-index:-10;
  zoom: 1;
  padding-top:120px;
  background-color: #fff;
  background-repeat: no-repeat;
  background-size: cover;
  -webkit-background-size: cover;
  -o-background-size: cover;
  background-position: center 0;
  /* max-width: 100%;
  height: 600px;
  background-repeat:no-repeat;
  padding-top:150px */
}
.loginContent{
  background-image: url("../assets/loginbg.png");
  margin-left: 500px;
  width: 400px;
  background-repeat:no-repeat;
  background-size:contain;
  padding-top:5px
}

.loginContent h3{
    margin-left: 30px; 
}

/* .loginContent input{
  border-bottom: 1px solid #dbdbdb;  
  border-top:none;  
  border-right:none;
} */


.loginSelect a{
    text-decoration:none;
    color:inherit;
    margin-top: 30px;
}

.accountStyle{
    margin-left: 1px;
}

.loginStyle{
    padding-top: 20px;
    width: 320px;
    margin-left: 35px;
}

/* 滑动验证码start */

    .drag{
        position: relative;
        background-color: #e8e8e8;
        width: 100%;
        height: 34px;
        line-height: 34px;
        text-align: center;
    }
    .handler{
        width: 40px;
        height: 32px;
        border: 1px solid #ccc;
        cursor: move;
    }
    .handler_bg{
        background: #fff url("data:image/png;base64,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") no-repeat center;
    }
    .handler_ok_bg{
        background: #fff url("data:image/png;base64,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") no-repeat center;
    }
    .drag_bg{
        background-color: #7ac23c;
        height: 34px;
        width: 0px;
    }
    .drag_text{
        position: absolute;
        top: 0px;
        width: 100%;text-align: center;
        -moz-user-select: none;
        -webkit-user-select: none;
        user-select: none;
        -o-user-select:none;
        -ms-user-select:none;
    }


</style>

效果图如下