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【vue核心技术实战精讲】1.9 Vue指令之v-model双向数据绑定

是波波呀 14小时前 阅读 2
前端html

第17次修改了可删除可持久保存的前端html备忘录:增加年月日星期,增加倒计时,更改保存区名称可以多个备忘录保存不一样的信息,匹配背景主题:现代深色

<!DOCTYPE html>
<html lang="zh">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>与妖为邻的文本备忘录</title>
  <style>
    * {
      list-style-type: none;
      padding: 0;
      margin: 0;
    }
    /* 按钮统一样式 */
    input,
    button {
      font-size: 20px;
      /* 小手 */
      cursor: pointer;
      border-radius: 5px;
    }
    /* **************************标题区********************************** */
    .h-div {
      display: flex;
      /* 两个块级元素之间间距 */
      gap: 10px;
      .h1-div {
        display: flex;
        align-items: center;
        button {
          margin-left: 45px;
        }
      }
      b {
        margin: 20px;
      }
      #appp {
        color: #ff0000;
        .bbbb,
        .cccc {
          /* 绝对定位 */
          position: absolute;
        }
        .bbbb {
          left: 1020px;
          background-color: #b70202;
        padding: 2px 10px;
        border-radius: 50%;
        }
        .cccc {
          left: 1180px;
        }
      }
      /* **************************翻牌时钟********************************** */
      .show {
        width: 200px;
        height: 75px;
        /* margin: 0px auto; */
        position: relative;
        color: #ff0000;
      }
      .time {
        display: flex;
        flex: 1;
        font-size: 40px;
        text-align: center;
        line-height: 75px;
        padding: 0 10px;
        overflow: hidden;
        position: absolute;
        top: 0px;
        left: 5px;
        right: 5px;
      }
      .beforeTime {
        z-index: 100;
      }
      .time li:nth-child(2n) {
        flex: 1;
      }
      .time li:nth-child(2n+1) {
        flex: 4;
        position: relative;
        height: 50px;
        line-height: 50px;
        margin: auto 0px;
        border-radius: 10px;
        box-shadow: 0px 0px 1px 1px rgb(1, 0, 0);
      }
      .time li:nth-child(2n+1) .upBox,
      .time li:nth-child(2n+1) .downBox {
        position: absolute;
        left: 0;
        right: 0;
        /* overflow: hidden; */
        /* 删除线 */
        text-decoration: line-through;
        text-decoration-color: rgb(69, 63, 63);
      }
      .time li:nth-child(2n+1) .upBox {
        top: 0;
        bottom: 50%;
        box-sizing: border-box;
        background-color: #3b3d3b;
        transform-origin: bottom;
        border-radius: 5px 5px 0 0;
      }
      .time li:nth-child(2n+1) .downBox {
        top: 50%;
        bottom: 0;
        line-height: 0;
        box-sizing: border-box;
        background-color: #3b3d3b;
        overflow: hidden;
        transform-origin: top;
        border-radius: 0 0 5px 5px;
      }
    }
    .down-div {
      sub {
        /* 外边距: 上右下左 */
        margin: 20px;
      }
      input[type="checkbox"] {
        margin: 0 0 0 50px;
      }
      .finish {
        /* 下划线 */
        text-decoration: underline;
        text-decoration-color: rgb(255, 0, 0);
        background-color: rgb(220, 226, 241);
        color: rgb(253, 250, 250);
        text-shadow: 1px 1px 1px #030303;
        box-shadow:
          inset -2px -2px 3px rgba(255, 255, 255, 0.6),
          inset 2px 2px 3px rgba(0, 0, 0, 0.6);
      }
    }
    /* *********文本操作框******************************************* */
    .login {
      display: none;
      width: 500px;
      height: 280px;
      position: fixed;
      border: #ebebeb solid 1px;
      left: 50%;
      top: 50%;
      border-radius: 15px 15px 0 0;
      z-index: 9999;
      transform: translate(-90%, -90%);
      border-radius: 15px;
      background-color: #cce7cc;
      .login-title {
        border-radius: 15px 15px 0 0;
        width: 100%;
        /*设置文字颜色*/
        color: #fff;
        text-shadow: 1px 1px 1px #0c0909;
        line-height: 40px;
        height: 40px;
        font-size: 20px;
        position: relative;
        cursor: move;
        background-color: #b5c7b5;
      }
      /*设置X*/
      #closeBtn {
        padding: 0px 10px 0px 10px;
        /*设置X靠右*/
        float: right;
        /*设置边框圆角*/
        /*设置文字大小*/
        font-size: 38px;
        top: -2px;
        right: 5px;
        /*设置绝对定位*/
        position: absolute;
        /*设置去掉斜体文字属性*/
        font-style: normal;
        /*设置鼠标悬停时显示小手*/
        cursor: pointer;
      }
      & i:hover {
        color: #110647;
      }
      .cl1ose-login {
        /*设置文字大小*/
        font-size: 25px;
        /*设置文字间距*/
        padding: 10px;
      }
      .up-div {
        display: flex;
        /*设置主轴方向 垂直显示*/
        flex-direction: column;
        border-radius: 10px;
        background-color: rgba(173, 17, 17, 0.5);
        height: 220px;
        margin: 10px;
        #myForm {
          display: flex;
          /*设置主轴方向 垂直显示*/
          flex-direction: column;
          box-sizing: border-box;
          border-radius: 10px;
          margin: 10px;
          padding: 5px;
          background-color: #c4a32c;
          & input[type="file"] {
            margin: 10px;
            background-color: #11b711;
            border-radius: 10px;
          }
          & textarea {
            font-size: 20px;
            /* 高 */
            height: 32px;
            border-radius: 5px;
            &::placeholder {
              font-size: 15px;
            }
          }
          & div {
            margin: 10px;
            display: flex;
            /*设置主轴方向 垂直显示
            flex-direction: center;*/
            /*设置	居中排列。*/
            justify-content: center;
            gap: 80px;
          }
        }
        .up-div1 {
          margin: 10px;
          .delete {
            color: #ff0101;
            /* 靠右 */
            float: right;
          }
        }
      }
    }
    body {
      background-color: #2b2b2b;
      input,
      button {
        text-shadow: 1px 1px 1px #000;
        color: #ffffff;
        /* 上下左右填充 */
        padding: 2px 10px;
        &:hover {
          background-color: rgb(255, 2, 2);
        }
      }
    }
    /* <!-- ---------------------3D背景样式---------------------------- --> */
    .up-div,
    #myForm,
    #prompt,
    .time,
    .aaaa,
    .bbbb,
    .cccc,
    b,
    sub,
    .h-div,
    input,
    button {
      background-image: linear-gradient(to top left,
          rgba(0, 0, 0, 0.2),
          rgba(0, 0, 0, 0.2) 30%,
          rgba(0, 0, 0, 0));
      box-shadow: inset 4px 4px 4px rgba(255, 255, 255, 0.6),
        inset -4px -4px 5px rgba(0, 0, 0, 0.6);
      border: 0px solid black;
    }
    /* 凹进去的样式 */
    .down-div span,
    dfn,
    button:active,
    input:active {
      box-shadow: inset -2px -2px 3px rgba(255, 255, 255, 0.6),
        inset 2px 2px 3px rgba(0, 0, 0, 0.6);
    }
    /* ****************标题区***************** */
    .h-div {
      background: linear-gradient(0.25turn, rgb(110, 123, 108), rgb(204, 232, 207), #f7d6d6);
      border-radius: 10px;
      button {
        background-color: rgb(255, 2, 2);
        &:hover {
          background-color: rgba(60, 203, 4, 0.826);
        }
      }
      b {
        background-color: #b70202;
        padding: 2px 10px;
        border-radius: 50%;
        color: #fafafa;
        text-shadow: 0px 1px 0px #999,
          0px 2px 0px #888,
          0px 3px 0px #777,
          0px 4px 0px #666,
          0px 5px 0px #555,
          0px 6px 0px #444,
          0px 7px 0px #333,
          0px 8px 7px #001135;
      }
      .bbbb {
        color: #ffffff;
        text-shadow: 1px 1px 1px #000;
        border-radius: 20px;
      }
      dfn{
        background-color: #fd0606;
            color: #ffffff;
            box-shadow: inset -2px -2px 3px rgba(255, 255, 255, 0.6),
              inset 2px 2px 3px rgba(0, 0, 0, 0.6);
            border-radius: 60px;
            text-shadow: 1px 1px 1px #fff, -1px -1px 1px #000;
      }
      .cccc,
      .aaaa {
        padding: 2px 10px;
        text-shadow: 1px 1px 1px #000;
      }
      .aaaa,
      .cccc,
      .time {
        background-color: #48603f;
        border-radius: 20%;
      }
    }
    .down-div {
      /* background: linear-gradient(0.25turn, #b7efea82, #cacf80ac, #f7d6d6); */
      background: #303745;
      p {
        color: #eaf7ff;
        text-shadow: 1px 1px 1px #000;
        sub {
          border-radius: 20px;
          background-color: #b0ef99;
        }
      }
      /* 设置复选框样式*/
      input[type="checkbox"] {
        background-color: #b8815d;
        -webkit-appearance: none;
        appearance: none;
        width: 25px;
        height: 25px;
        position: relative;
        border-radius: 50%;
      }
      input[type="checkbox"]::after {
        content: "";
        width: 100%;
        height: 100%;
        border: 2px solid #e9f504;
        position: absolute;
        left: -3px;
        top: -3px;
        border-radius: 50%;
      }
      /* 设置复选框点击之后的样式*/
      input[type="checkbox"]:checked::after {
        height: 15px;
        width: 25px;
        border-top: none;
        border-right: none;
        border-radius: 0;
        transform: rotate(-45deg);
        transition: all 0.5s ease-in-out;
      }
      span {
        border-radius: 20px;
        color: #75a8c6;
        text-shadow: 1px 1px 1px #000;
        padding: 0 10px;
        button {
          background-color: green;
          a {
            color: #ffffff;
            text-shadow: 1px 1px 1px #030303;
          }
        }
      }
    }
    /* ***************文本操作窗口****************** */
    #myForm {
      textarea {
        line-height: 1.5em;
        background: #303745;
        text-shadow: 1px 1px 1px #000;
        color: #ffffff;
        &::placeholder {
          color: #ffffff;
          text-shadow: 1px 1px 1px #000000;
        }
      }
      button,
      input {
        background: #155f01;
        &:hover {
          background-color: rgb(255, 2, 2);
        }
      }
    }
    .up-div1 {
      button,
      input {
        background: #48603f;
        a {
          color: #155f01;
        }
      }
    }
  </style>
</head>
<body>
  <div class="h-div">
    <!-- --------------------h1-div------------------------------- -->
    <div class="h1-div">
      <h1>
        <button class="login-header" id="link" href="javascript:;">文本操作框</button>
        <b>备忘录</b>
        <dfn>memo</dfn>
        <a id="appp"></a>
      </h1>
    </div>
    <!-- ------------------------翻牌时钟--------------------------- -->
    <div class="show">
      <ul class="time">
        <li>
          <div class="upBox beforeTime"></div>
          <div class="downBox beforeTime"></div>
          <div class="upBox afterTime"></div>
          <div class="downBox afterTime"></div>
        </li>
        <li>:</li>
        <li>
          <div class="upBox beforeTime"></div>
          <div class="downBox beforeTime"></div>
          <div class="upBox afterTime"></div>
          <div class="downBox afterTime"></div>
        </li>
        <li>:</li>
        <li>
          <div class="upBox beforeTime"></div>
          <div class="downBox beforeTime"></div>
          <div class="upBox afterTime"></div>
          <div class="downBox afterTime"></div>
        </li>
      </ul>
    </div>
  </div>
  <!-- ------------------------备忘录--------------------------- -->
  <div id="login" class="login">
    <div id="title" class="login-title">
      <span class="cl1ose-login">文本操作</span>
      <i href="javascript:void(0);" id="closeBtn">&times</i>
    </div>
    <div class="up-div">
      <form id="myForm">
        <input type="file" name="inputfile" accept="text/plain, text/css, text/html, text/javascript, text/markdown"
          class="background3D" />
        <textarea class="up-textarea" name="uptextarea" rows="1" cols="30%"
          placeholder="请选择txt、js、css或html文件,文件内容会被自动读取"></textarea>
        <div>
          <button type="text" class="up-button">添加</button>
          <input type="reset" value="重置">
        </div>
      </form>
      <hr>
      <div class="up-div1">
        <button id="openButton">打开URL</button>
        <button class="a-href"><a href="https://www.baidu.com/s" target="_blank">百度一下</a></button>
        <button class="a-href"><a href="https://blog.csdn.net/lulei5153?spm=1011.2415.3001.5343"
            target="_blank">与妖为邻</a></button>
        <button id="up-button1" class="delete">对选择删除</button>
      </div>
    </div>
  </div>
  <hr>
  <div class="down-div" id="oContent">
    <p>
      <!-- <sub>
        护眼背景 &amp;lt;style&amp;gt;
        body { background-color: #303745; color: #75a8c6; text-shadow: 1px 1px 1px #000000; }
        &amp;lt;/style&amp;gt;
      </sub> -->
      <sub> &lt;button class="a-href"&gt;
        &lt;a href="输入网站地址" target="_blank"&gt;
        输入网站名称
        &lt;/a&gt; &lt;/button&gt;
      </sub>
    </p>
  </div>
</body>
<script>
  /**/
  //格式化时间
  const formatTime = (time) => {
    if (time < 10) time = '0' + time
    return time
  }
  //翻转前面下面的盒子向上180deg
  const rotateUp = (ele, time, n) => {
    //传入的为一开始翻转的元素,即前面下面的盒子,以及新时间,以及第几个li盒子
    let rotateDeg = 0;
    ele.style.zIndex = 50;
    //这个是所有上面的盒子
    const allUpBox = document.querySelector(`li:nth-child(${n})`).querySelectorAll('.upBox');
    //所有前面的盒子
    const beforeTime = document.querySelector(`li:nth-child(${n})`).querySelectorAll('.beforeTime');
    // 让上面后面的盒子先不可见,然后设置为270°
    allUpBox[1].style.display = 'none';
    allUpBox[1].transform = `rotateX(270deg)`;
    const animation = () => {
      rotateDeg += 3;
      ele.style.transform = `perspective(500px) rotateX(${rotateDeg}deg)`;
      if (rotateDeg == 90) {
        //让它更新为最近时间后隐藏
        ele.innerHTML = time
        ele.style.zIndex = -1;
        //让刚刚上面隐藏的盒子重新显示出来并且完成90°-180°的旋转
        allUpBox[1].style.display = 'block';
        allUpBox[0].style.zIndex = 1;
        rotateDown(allUpBox[1])
        allUpBox[1].style.zIndex = 1;
      }
      if (rotateDeg == 150) {
        beforeTime[0].innerHTML = time
      }
      if (rotateDeg < 180) {
        requestAnimationFrame(animation);
      }
    }
    animation()
  }
  const rotateDown = (ele) => {
    let rotateDeg = 270;
    const animation = () => {
      rotateDeg += 3;
      ele.style.transform = `perspective(500px) rotateX(${rotateDeg}deg)`;
      if (rotateDeg < 360) {
        requestAnimationFrame(animation);
      }
    }
    animation()
  }
  let time = new Date();
  let oldHour = time.getHours();
  var oldMinute = time.getMinutes();
  var oldSecond = time.getSeconds();
  document.querySelector('li:nth-child(1)').querySelectorAll('.beforeTime').forEach(ele => ele.innerHTML = formatTime(oldHour));
  document.querySelector(' li:nth-child(3)').querySelectorAll('.beforeTime').forEach(ele => ele.innerHTML = formatTime(oldMinute));
  document.querySelector(' li:nth-child(5)').querySelectorAll('.beforeTime').forEach(ele => ele.innerHTML = formatTime(oldSecond));
  const changeTime = () => {
    let time = new Date();
    let hour = time.getHours();
    let minute = time.getMinutes();
    let second = time.getSeconds();
    const setHourBox = document.querySelector('li:nth-child(1)').querySelectorAll('.afterTime');
    if (!setHourBox[0].innerHTML || setHourBox[0].innerHTML != formatTime(hour)) {
      if (setHourBox[0].innerHTML) rotateUp(document.querySelector('li:nth-child(1)').querySelectorAll('.beforeTime')[1], formatTime(hour), 1);
      setHourBox.forEach(ele => ele.innerHTML = formatTime(hour));
    }
    const setMinuteBox = document.querySelector('li:nth-child(3)').querySelectorAll('.afterTime');
    if (!setMinuteBox[0].innerHTML || setMinuteBox[0].innerHTML != formatTime(minute)) {
      if (setMinuteBox[0].innerHTML) rotateUp(document.querySelector('li:nth-child(3)').querySelectorAll('.beforeTime')[1], formatTime(minute), 3);
      setMinuteBox.forEach(ele => ele.innerHTML = formatTime(minute));
    }
    const setSecondBox = document.querySelector('li:nth-child(5)').querySelectorAll('.afterTime')
    setSecondBox.forEach(ele => ele.innerHTML = formatTime(second));
    rotateUp(document.querySelector('li:nth-child(5)').querySelectorAll('.beforeTime')[1], formatTime(second), 5)
    setTimeout(changeTime, 1000);
  }
  changeTime();
  /* **************************倒计时函数********************************** */
  function showTime2() {
    var d1 = new Date(); // 当前时间
    var d = new Date();
    var y = d.getFullYear();
    var m = d.getMonth() + 1;
    var W = "星期" + "日一二三四五六".charAt(new Date().getDay());
    var D1 = d.getDate();
    var d2 = new Date(2024, 4, 1, 0, 0, 0); // 2024年3月9日0点0分0秒,月份从0开始计数,所以2月是1
    var diff = Math.floor((d2 - d1) / 1000); // 计算时间差,单位为秒
    var D = Math.floor(diff / (24 * 3600)); // 计算天数
    var H = Math.floor((diff % (24 * 3600)) / 3600); // 计算小时数
    var M = Math.floor((diff % 3600) / 60); // 计算分钟数
    var S = diff % 60; // 计算秒数
    var appp = document.getElementById('appp');
    appp.innerHTML = '<a class="aaaa">' + y + '年' + m + '月' + D1 + '日' + W + '</a>' + '<a class="bbbb">距离五一</a><a class="cccc">' + D + '天' + H + '小时' + M + '分钟' + S + '秒</a>'; // 显示倒计时时间差,格式为"X天X小时X分钟X秒"
  }
  showTime2();
  setInterval(showTime2, 1000); // 每隔1秒执行一次showTime函数
  /**************************备忘录********************************/
  var uptext = document.querySelector(".up-textarea");
  var addto = document.querySelector(".up-button");
  var text = document.querySelector(".down-div");
  /*************添加事件*****************/
  addto.onclick = function () {
    inserhtml(uptext.value, '');
    // 添加后清空输入框
    uptext.value = '';
    // 焦点放回输入框
    uptext.focus();
    savetodo();
  }
  /*************savetodo函数****************/
  var savetodo = function () {
    let todoarr = [];
    let todojs = {};
    var econtent = document.querySelectorAll('.content');
    for (let index = 0; index < econtent.length; index++) {
      todojs.name = econtent[index].innerHTML;
      todojs.finish = econtent[index].classList.contains('finish');
      todoarr.push(todojs);
      todojs = {};
    }
    save(todoarr);
  }
  var loadtodo = function () {
    let todoarr = load();
    for (let index = 0; index < todoarr.length; index++) {
      inserhtml(todoarr[index].name, todoarr[index].finish ? 'finish' : '');
    }
  }
  /**********************本地持久储存(localStorage)函数*****************************/
  var save = function (arr) {
    /**JSON.stringify(arr) 先将数组转换为字符串   
     *localStorage.todotext 然后将字符串保存到本地的todotext中*/
    localStorage.todotext = JSON.stringify(arr);
  }
  /**
   *读取函数,把todotext转成数组
   *然后返回数组*/
  var load = function (arr) {
    var arr = JSON.parse(localStorage.todotext);
    return arr;
  }
  /**********************finish样式函数*****************************/
  /**********************按钮点击事件*****************************/
  text.onclick = function () {
    var tg = event.target;
    // 获取父元素下的所有子元素
    var tgkids = tg.parentElement.children;
    /*******************************对复选框的点击事件******************************/
    if (tgkids[0].checked) {
      tgkids[1].classList.add("finish");
    }
    else {
      tgkids[1].classList.remove("finish");
    }
    // 保存更改的样式
    savetodo();
    /*******************************对选择的进行删除********************************************/
    var Select = document.getElementById("up-button1");
    Select.onclick = function () {
      if (confirm("是否删除所选?")) {
        var check = document.getElementsByName("checkbox");
        for (var i = 0; i < check.length; i++) {
          if (check[i].checked) {
            check[i].parentElement.remove();
            i--;
            // 删除后保存
            savetodo();
          }
        }
      }
    }
  }
  var inserhtml = function (val, cls) {
    text.insertAdjacentHTML("beforeend",
      `<div>
            <input type="checkbox" name='checkbox'>               
            <span class='content ${cls}'>${val}</span>   
       </div>`
    )
  }
  loadtodo();
  /*****************************提示弹窗无需点击的函数**********************************************/
  function displayAlert(type, data, time) {
    var prompt = document.createElement("div");
    if (type == "success") {
      prompt.style.width = "200px";
      prompt.style.backgroundColor = "#009900";
    } else if (type == "error") {
      prompt.style.width = "280px";
      prompt.style.backgroundColor = "#990000";
    } else if (type == "info") {
      prompt.style.backgroundColor = " #e6b800";
      prompt.style.width = "600px";
    } else {
      return;
    }
    prompt.id = "prompt";
    prompt.style.textAlign = "center";
    prompt.style.position = "absolute";
    prompt.style.height = "60px";
    prompt.style.marginLeft = "-100px";
    prompt.style.marginTop = "-30px";
    prompt.style.left = "30%";
    prompt.style.top = "5%";
    prompt.style.color = "white";
    prompt.style.fontSize = "25px";
    prompt.style.borderRadius = "20px";
    prompt.style.textAlign = "center";
    prompt.style.lineHeight = "60px";
    if (document.getElementById("") == null) {
      document.body.appendChild(prompt);
      prompt.innerHTML = data;
      setTimeout(function () {
        document.body.removeChild(prompt);
      }, time);
    }
  }
  /**************************打开URL按钮的JavaScript******************************************/
  // 获取打开URL按钮元素
  var openBtn = document.getElementById("openButton");
  // 添加点击事件处理程序
  openBtn.addEventListener('click', function () {
    // 获取文件路径
    // 这里假设您已经有一个函数来获取文件路径,例如 prompt('请输入文件路径', 'D:/前端学习', '_blank');
    var filePath = prompt("请输入网站地址或者本地文件路径", "D:/备忘录信息");
    if (filePath) {
      // 使用window.location对象的assign()方法导航到指定文件
      // window.location.assign(filePath);
      // 或者使用window.open()方法打开新窗口导航到指定文件
      window.open(filePath);
    } else {
      displayAlert('info', '未提供有效的文件路径!', 1500);
      // alert("未提供有效的文件路径!");
    }
  });
  /**************************本地文件读取的函数******************************************/
  window.onload = function () {
    var text = document.getElementsByName('uptextarea')[0],
      inputFile = document.getElementsByName('inputfile')[0];
    //上传文件
    inputFile.onchange = function () {
      console.log(this.files);
      var reader = new FileReader();
      reader.readAsText(this.files[0], 'UTF-8');
      reader.onload = function (e) {
        // urlData就是对应的文件内容
        var urlData = this.result;
        text.value = urlData;
      };
    };
  };
  /**************************复制文本******************************************/
  var oContent = document.getElementById('oContent');
  oContent.ondragend = function () {
    document.execCommand("Copy");
    // alert("复制成功")
    displayAlert('error', '复制成功!', 1500);
  };
  /********************文本操作框*****************************************/
  // 1. 获取元素
  var login = document.querySelector('.login');
  var mask = document.querySelector('.down-div');
  // 2. 点击弹出层这个链接link,让mask和login显示出来
  link.addEventListener('click', function () {
    mask.style.display = 'block';
    login.style.display = 'block';
  });
  // 3. 点击closeBtn就隐藏mask和login
  closeBtn.addEventListener('click', function () {
    // mask.style.display = 'none';
    login.style.display = 'none';
  });
  // 4. 开始拖拽
  //(1)当我们鼠标按下,就获得鼠标在盒子内的坐标
  title.addEventListener('mousedown', function (e) {
    var x = e.pageX - login.offsetLeft;
    var y = e.pageY - login.offsetTop;
    //(2)鼠标移动的时候,把鼠标在页面中的坐标,减去鼠标在盒子内的坐标就是模态框的left和top值
    document.addEventListener('mousemove', move);
    function move(e) {
      login.style.left = e.pageX - x + 'px';
      login.style.top = e.pageY - y + 'px';
    }
    //(3)鼠标弹起,就让鼠标移动事件移除
    document.addEventListener('mouseup', function () {
      document.removeEventListener('mousemove', move);
    });
  });
</script>
</html>
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