【练习】Vue实现记事本

功能要求

• 输入框输入后，回车可添加输入的内容到事件栏
• 鼠标移到某一栏上可以点击×进行该栏的删除
• 左下角可以统计事件的条数
• 右下角可以清空事件

实现步骤

• 生成列表结构(v-for 数组)
• 获取用户输入(v-model 双向绑定)
• 回车,新增数据(v-on .enter事件修饰符)
• 页面布局不熟悉，可以通过审查元素的方式快速找到元素

CSS代码

html,
body {
    
    
  margin: 0;
  padding: 0;
}
body {
    
    
  background: #fff ;
}
button {
    
    
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  font-size: 100%;
  vertical-align: baseline;
  font-family: inherit;
  font-weight: inherit;
  color: inherit;
  -webkit-appearance: none;
  appearance: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
    
    
  font: 14px "Helvetica Neue", Helvetica, Arial, sans-serif;
  line-height: 1.4em;
  background: #f1b7b7;
  color: #4d4d4d;
  min-width: 230px;
  max-width: 550px;
  margin: 0 auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-weight: 300;
}

:focus {
    
    
  outline: 0;
}

.hidden {
    
    
  display: none;
}

#app {
    
    
  background: #fff;
  margin: 180px 0 40px 0;
  position: relative;
  box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), 0 25px 50px 0 rgba(0, 0, 0, 0.1);
}

#app input::-webkit-input-placeholder {
    
    
  font-style: italic;
  font-weight: 300;
  color: #e6e6e6;
}

#app input::-moz-placeholder {
    
    
  font-style: italic;
  font-weight: 300;
  color: #e6e6e6;
}

#app input::input-placeholder {
    
    
  font-style: italic;
  font-weight: 300;
  color: gray;
}

#app h1 {
    
    
  position: absolute;
  top: -160px;
  width: 100%;
  font-size: 60px;
  font-weight: 100;
  text-align: center;
  color: rgba(175, 47, 47, .8);
  -webkit-text-rendering: optimizeLegibility;
  -moz-text-rendering: optimizeLegibility;
  text-rendering: optimizeLegibility;
}

.new-todo,
.edit {
    
    
  position: relative;
  margin: 0;
  width: 100%;
  font-size: 24px;
  font-family: inherit;
  font-weight: inherit;
  line-height: 1.4em;
  border: 0;
  color: inherit;
  padding: 6px;
  border: 1px solid #999;
  box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.new-todo {
    
    
  padding: 16px;
  border: none;
  background: rgba(0, 0, 0, 0.003);
  box-shadow: inset 0 -2px 1px rgba(0, 0, 0, 0.03);
}

.main {
    
    
  position: relative;
  z-index: 2;
  border-top: 1px solid #e6e6e6;
}

.toggle-all {
    
    
  width: 1px;
  height: 1px;
  border: none; /* Mobile Safari */
  opacity: 0;
  position: absolute;
  right: 100%;
  bottom: 100%;
}

.toggle-all + label {
    
    
  width: 60px;
  height: 34px;
  font-size: 0;
  position: absolute;
  top: -52px;
  left: -13px;
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
}

.toggle-all + label:before {
    
    
  content: "❯";
  font-size: 22px;
  color: #e6e6e6;
  padding: 10px 27px 10px 27px;
}

.toggle-all:checked + label:before {
    
    
  color: #737373;
}

.listview {
    
    
  margin: 0;
  padding: 0;
  list-style: none;
  max-height: 420px;
  overflow: auto;
}

.listview li {
    
    
  position: relative;
  font-size: 24px;
  border-bottom: 1px solid #ededed;
  height: 60px;
  box-sizing: border-box;
}

.listview li:last-child {
    
    
  border-bottom: none;
}

.listview .view .index {
    
    
  position: absolute;
  color: gray;
  left: 10px;
  top: 20px;
  font-size: 16px;
}

.listview li .toggle {
    
    
  text-align: center;
  width: 40px;
  /* auto, since non-WebKit browsers doesn't support input styling */
  height: auto;
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto 0;
  border: none; /* Mobile Safari */
  -webkit-appearance: none;
  appearance: none;
}

.listview li .toggle {
    
    
  opacity: 0;
}

.listview li .toggle + label {
    
    
  /*
		Firefox requires `#` to be escaped - https://bugzilla.mozilla.org/show_bug.cgi?id=922433
		IE and Edge requires *everything* to be escaped to render, so we do that instead of just the `#` - https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7157459/
	*/
  background-image: url("data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23ededed%22%20stroke-width%3D%223%22/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center left;
}

.listview li .toggle:checked + label {
    
    
  background-image: url("data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23bddad5%22%20stroke-width%3D%223%22/%3E%3Cpath%20fill%3D%22%235dc2af%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22/%3E%3C/svg%3E");
}

.listview li label {
    
    
  word-break: break-all;
  padding: 15px 15px 15px 60px;
  display: block;
  line-height: 1.2;
  transition: color 0.4s;
}

.listview li.completed label {
    
    
  color: #d9d9d9;
  text-decoration: line-through;
}

.listview li .destroy {
    
    
  display: none;
  position: absolute;
  top: 0;
  right: 10px;
  bottom: 0;
  width: 40px;
  height: 40px;
  margin: auto 0;
  font-size: 30px;
  color: #cc9a9a;
  margin-bottom: 11px;
  transition: color 0.2s ease-out;
}

.listview li .destroy:hover {
    
    
  color: #af5b5e;
}

.listview li .destroy:after {
    
    
  content: "×";
}

.listview li:hover .destroy {
    
    
  display: block;
}

.listview li .edit {
    
    
  display: none;
}

.listview li.editing:last-child {
    
    
  margin-bottom: -1px;
}

.footer {
    
    
  color: #777;
  padding: 10px 15px;
  height: 20px;
  text-align: center;
  border-top: 1px solid #e6e6e6;
}

.footer:before {
    
    
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 50px;
  overflow: hidden;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2), 0 8px 0 -3px #f6f6f6,
    0 9px 1px -3px rgba(0, 0, 0, 0.2), 0 16px 0 -6px #f6f6f6,
    0 17px 2px -6px rgba(0, 0, 0, 0.2);
}

.todo-count {
    
    
  float: left;
  text-align: left;
}

.todo-count strong {
    
    
  font-weight: 300;
}

.filters {
    
    
  margin: 0;
  padding: 0;
  list-style: none;
  position: absolute;
  right: 0;
  left: 0;
}

.filters li {
    
    
  display: inline;
}

.filters li a {
    
    
  color: inherit;
  margin: 3px;
  padding: 3px 7px;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 3px;
}

.filters li a:hover {
    
    
  border-color: rgba(175, 47, 47, 0.1);
}

.filters li a.selected {
    
    
  border-color: rgba(175, 47, 47, 0.2);
}

.clear-completed,
html .clear-completed:active {
    
    
  float: right;
  position: relative;
  line-height: 20px;
  text-decoration: none;
  cursor: pointer;
}

.clear-completed:hover {
    
    
  text-decoration: underline;
}

.info {
    
    
  margin: 50px auto 0;
  color: #bfbfbf;
  font-size: 15px;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
  text-align: center;
}

.info p {
    
    
  line-height: 1;
}

.info a {
    
    
  color: inherit;
  text-decoration: none;
  font-weight: 400;
}

.info a:hover {
    
    
  text-decoration: underline;
}

/*
	Hack to remove background from Mobile Safari.
	Can't use it globally since it destroys checkboxes in Firefox
*/
@media screen and (-webkit-min-device-pixel-ratio: 0) {
    
    
  .toggle-all,
  .listview li .toggle {
    
    
    background: none;
  }

  .listview li .toggle {
    
    
    height: 40px;
  }
}

@media (max-width: 430px) {
    
    
  .footer {
    
    
    height: 50px;
  }

  .filters {
    
    
    bottom: 10px;
  }
}

HTML代码

<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
    <title>小黑记事本</title>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
    <meta name="robots" content="noindex, nofollow" />
    <meta name="googlebot" content="noindex, nofollow" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link rel="stylesheet" type="text/css" href="../css/index.css" />
  </head>

  <body>
    <!-- VUE示例接管区域 -->
    <section id="app">
      <!-- 输入框 -->
      <header class="header">
        <h1>VUE记事本</h1>
        <input
          autofocus="autofocus"
          autocomplete="off"
          placeholder="输入日程"
          class="new-todo"
          v-model="inputValue"
          @keyup.enter="add"
        />
      </header>

      <!-- 列表区域 -->
      <section class="main">
        <ul class="listview">
          <!-- 1、使用v-for指令遍历数组list生成列表结构 -->
          <li class="todo" v-for="(item,index) in list">
            <div class="view">
              <span class="index">{
   
   {index+1}}.</span> <label>{
   
   {item}}</label>
              <button class="destroy" @click="remove(index)"></button>
            </div>
          </li>
        </ul>
      </section>
      <!-- 统计和清空 -->
      <footer class="footer">
        <span class="todo-count">
          <strong>{
   
   {list.length}}</strong> items left
        </span>
        <button class="clear-completed" @click="clear">Clear</button>
      </footer>
    </section>
  </body>
</html>  

JavaScript代码

<!-- 开发环境版本，包含了有帮助的命令行警告 -->
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
  <script>
    var VM = new Vue({
    
    
      el: "#app",
      data: {
    
    
        list: ["写代码", "干饭", "睡觉"],
        inputValue: "995还是997",
      },
      methods: {
    
    
        //新增日程的方法
        add() {
    
    
          //   将用户输入的值进行存储
          this.list.push(this.inputValue);
        },
        remove(index) {
    
    
          //将指定的值删除
          console.log(index);
          //使用splice(元素的索引,删除几个)
          this.list.splice(index, 1);
        },
        clear() {
    
    
          this.list = [];
        },
      },
    });
  </script>