JavaWeb（11）——前端综合案例5（小黑记事本）

ゝ一纸荒年。 2023-10-14 16:44 16阅读 0赞

## 一、实例需求 ⌛ ##

![44c2daa74ae44f5ca8c1d3c490be3c75.png][]

功能需求： ① 列表渲染 ② 删除功能 ③ 添加功能 ④ 底部统计 和 清空任务

![60066206b2e8465aa4110509230e9855.png][]

## 二、代码实现 ☕ ##

<!DOCTYPE html>
    <html lang="en">
    <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" />
    <link rel="stylesheet" href="./css/index.css" />
    <title>记事本</title>
    </head>
    <body>
    
    
    <section id="app">
      
      <header class="header">
        <h1>小黑记事本</h1>
        <input v-model="todoName"  placeholder="请输入任务" class="new-todo" />
        <button @click="add" class="add">添加任务</button>
      </header>
      
      <section class="main">
        <ul class="todo-list">
          <li class="todo" v-for="(item, index) in list" :key="item.id">
            <div class="view">
              <span class="index">{
       { index + 1 }}.</span> <label>{
       { item.name }}</label>
              <button @click="del(item.id)" class="destroy"></button>
            </div>
          </li>
        </ul>
      </section>
      
      <footer class="footer" v-show="list.length > 0">
        
        <span class="todo-count">合 计:<strong> {
       { list.length }} </strong></span>
        
        <button @click="clear" class="clear-completed">
          清空任务
        </button>
      </footer>
    </section>
    
    
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
      // 添加功能
      // 1. 通过 v-model 绑定 输入框 → 实时获取表单元素的内容
      // 2. 点击按钮，进行新增，往数组最前面加 unshift
      const app = new Vue({
        el: '#app',
        data: {
          todoName: '',
          list: [
            { id: 1, name: '跑步一公里' },
            { id: 3, name: '游泳100米' },
          ]
        },
        methods: {
          del (id) {
            // console.log(id) => filter 保留所有不等于该 id 的项
            this.list = this.list.filter(item => item.id !== id)
          },
          add () {
            if (this.todoName.trim() === '') {
              alert('请输入任务名称')
              return
            }
            this.list.unshift({
              id: +new Date(),
              name: this.todoName
            })
            this.todoName = ''
          },
          clear () {
            this.list = []
          }
        }
      })
    
    </script>
    </body>
    </html>

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: #f5f5f5;
      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;
      padding: 15px;
      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 .header input {
      border: 2px solid rgba(175, 47, 47, 0.8);
      border-radius: 10px;
    }
    #app .add {
      position: absolute;
      right: 15px;
      top: 15px;
      height: 68px;
      width: 140px;
      text-align: center;
      background-color: rgba(175, 47, 47, 0.8);
      color: #fff;
      cursor: pointer;
      font-size: 18px;
      border-radius: 0 10px 10px 0;
    }
    
    #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: -120px;
      width: 100%;
      left: 50%;
      transform: translateX(-50%);
      font-size: 60px;
      font-weight: 100;
      text-align: center;
      color: rgba(175, 47, 47, 0.8);
      -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;
      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;
    }
    
    .todo-list {
      margin: 0;
      padding: 0;
      list-style: none;
      overflow: hidden;
    }
    
    .todo-list li {
      position: relative;
      font-size: 24px;
      height: 60px;
      box-sizing: border-box;
      border-bottom: 1px solid #e6e6e6;
    }
    
    .todo-list li:last-child {
      border-bottom: none;
    }
    
    .todo-list .view .index {
      position: absolute;
      color: gray;
      left: 10px;
      top: 20px;
      font-size: 22px;
    }
    
    .todo-list 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;
    }
    
    .todo-list li .toggle {
      opacity: 0;
    }
    
    .todo-list 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;
    }
    
    .todo-list 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');
    }
    
    .todo-list li label {
      word-break: break-all;
      padding: 15px 15px 15px 60px;
      display: block;
      line-height: 1.2;
      transition: color 0.4s;
    }
    
    .todo-list li.completed label {
      color: #d9d9d9;
      text-decoration: line-through;
    }
    
    .todo-list 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;
    }
    
    .todo-list li .destroy:hover {
      color: #af5b5e;
    }
    
    .todo-list li .destroy:after {
      content: '×';
    }
    
    .todo-list li:hover .destroy {
      display: block;
    }
    
    .todo-list li .edit {
      display: none;
    }
    
    .todo-list 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,
      .todo-list li .toggle {
        background: none;
      }
    
      .todo-list li .toggle {
        height: 40px;
      }
    }
    
    @media (max-width: 430px) {
      .footer {
        height: 50px;
      }
    
      .filters {
        bottom: 10px;
      }
    }

![13e4d18ffbc44332ad5bbc4e5000f6cb.png][]

[44c2daa74ae44f5ca8c1d3c490be3c75.png]: https://img-blog.csdnimg.cn/44c2daa74ae44f5ca8c1d3c490be3c75.png
[60066206b2e8465aa4110509230e9855.png]: https://img-blog.csdnimg.cn/60066206b2e8465aa4110509230e9855.png
[13e4d18ffbc44332ad5bbc4e5000f6cb.png]: https://img-blog.csdnimg.cn/13e4d18ffbc44332ad5bbc4e5000f6cb.png