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      Vue.js 实例

      Vue.js 实例

      本章节为大家介绍几个 Vue.js 实例,通过实例练习来巩固学到的知识点。

      导航菜单实例

      创建一个简单的导航菜单:

      <div id="main">
      
          <!-- 激活的菜单样式为  active 类 -->
          <!-- 为了阻止链接在点击时跳转,我们使用了 "prevent" 修饰符 (preventDefault 的简称)。 -->
      
          <nav v-bind:class="active" v-on:click.prevent>
      
              <!-- 当菜单上的链接被点击时,我们调用了 makeActive 方法, 该方法在 Vue 实例中创建。 -->
      
              <a href="#" class="home" v-on:click="makeActive('home')">Home</a>
              <a href="#" class="projects" v-on:click="makeActive('projects')">Projects</a>
              <a href="#" class="services" v-on:click="makeActive('services')">Services</a>
              <a href="#" class="contact" v-on:click="makeActive('contact')">Contact</a>
          </nav>
      
           <!-- 以下 "active" 变量会根据当前选中的值来自动变换 -->
      
          <p>您选择了 <b>{{active}} 菜单</b></p>
      </div>
      
      <script>
      // 创建一个新的 Vue 实例
      var demo = new Vue({
          // DOM 元素,挂载视图模型
          el: '#main',
      
          // 定义属性,并设置初始值
          data: {
              active: 'home'
          },
      
          // 点击菜单使用的函数
          methods: {
              makeActive: function(item){
                  // 模型改变,视图会自动更新
                  this.active = item;
              }
          }
      });
      </script>
      

      编辑文本实例

      点击指定文本编辑内容:

      <!-- v-cloak 隐藏未编译的变量,直到 Vue 实例准备就绪。 -->
      <!-- 元素点击后 hideTooltp() 方法被调用 -->
      
      <div id="main" v-cloak v-on:click="hideTooltip">
      
          <!-- 这是一个提示框
               v-on:click.stop 是一个点击事件处理器,stop 修饰符用于阻止事件传递
               v-if 用来判断 show_tooltip 为 true 时才显示 -->
      
          <div class="tooltip" v-on:click.stop v-if="show_tooltip">
      
              <!-- v-model 绑定了文本域的内容
               在文本域内容改变时,对应的变量也会实时改变  -->
      
              <input type="text" v-model="text_content" />
          </div>
      
          <!-- 点击后调用 "toggleTooltip" 方法并阻止事件传递 -->
      
          <!--  "text_content" 变量根据文本域内容的变化而变化 -->
      
          <p v-on:click.stop="toggleTooltip">{{text_content}}</p>
      
      </div>
      
      <script>
      var demo = new Vue({
          el: '#main',
          data: {
              show_tooltip: false,
              text_content: '点我,并编辑内容。'
          },
          methods: {
              hideTooltip: function(){
                  // 在模型改变时,视图也会自动更新
                  this.show_tooltip = false;
              },
              toggleTooltip: function(){
                  this.show_tooltip = !this.show_tooltip;
              }
          }
      })
      </script>
      

      订单列表实例

      创建一个订单列表,并计算总价:

      <form id="main" v-cloak>
      
          <h1>Services</h1>
      
          <ul>
      
              <!-- 循环输出 services 数组, 设置选项点击后的样式 -->
      
              <li v-for="service in services" v-on:click="toggleActive(service)" v-bind:class="{ 'active': service.active}">
      
                  <!-- 显示订单中的服务名,价格
                       Vue.js 定义了货币过滤器,用于格式化价格 -->
      
                  {{service.name}} <span>{{service.price | currency}}</span>
      
              </li>
          </ul>
      
          <div class="total">
      
              <!-- 计算所有服务的价格,并格式化货币 -->
      
              Total: <span>{{total() | currency}}</span>
      
          </div>
      
      </form>
      <script>
      
      // 自定义过滤器 "currency".
      Vue.filter('currency', function (value) {
          return '$' + value.toFixed(2);
      });
      
      var demo = new Vue({
          el: '#main',
          data: {
              // 定义模型属性 the model properties. The view will loop
              // 视图将循环输出数组的数据
              services: [
                  {
                      name: 'Web Development',
                      price: 300,
                      active:true
                  },{
                      name: 'Design',
                      price: 400,
                      active:false
                  },{
                      name: 'Integration',
                      price: 250,
                      active:false
                  },{
                      name: 'Training',
                      price: 220,
                      active:false
                  }
              ]
          },
          methods: {
              toggleActive: function(s){
                  s.active = !s.active;
              },
              total: function(){
      
                  var total = 0;
      
                  this.services.forEach(function(s){
                      if (s.active){
                          total+= s.price;
                      }
                  });
      
                 return total;
              }
          }
      });
      
      </script>
      

      搜索页面实例

      在输入框输入搜索内容,列表显示配置的列表:

      <form id="main" v-cloak>
      
          <div class="bar">
              <!-- searchString 模型与文本域创建绑定 -->
      
              <input type="text" v-model="searchString" placeholder="输入搜索内容" />
          </div>
      
          <ul>
              <!-- 循环输出数据 -->
      
              <li v-for="article in filteredArticles">
                  <a v-bind:href="article.url"><img v-bind:src="article.image" /></a>
                  <p>{{article.title}}</p>
              </li>
          </ul>
      
      </form>
      <script>
      
      var demo = new Vue({
          el: '#main',
          data: {
              searchString: "",
      
              // 数据模型,实际环境你可以根据 Ajax 来获取
      
              articles: [
                  {
                      "title": "What You Need To Know About CSS Variables",
                      "url": "https://www.axihe.com/css/css-tutorial.html",
                      "image": "https://static.axihe.com/images/icon/css.png"
                  },
                  {
                      "title": "Freebie: 4 Great Looking Pricing Tables",
                      "url": "https://www.axihe.com/html/html-tutorial.html",
                      "image": "https://static.axihe.com/images/icon/html.png"
                  },
                  {
                      "title": "20 Interesting JavaScript and CSS Libraries for February 2016",
                      "url": "https://www.axihe.com/css3/css3-tutorial.html",
                      "image": "https://static.axihe.com/images/icon/css3.png"
                  },
                  {
                      "title": "Quick Tip: The Easiest Way To Make Responsive Headers",
                      "url": "https://www.axihe.com/css3/css3-tutorial.html",
                      "image": "https://static.axihe.com/images/icon/css3.png"
                  },
                  {
                      "title": "Learn SQL In 20 Minutes",
                      "url": "https://www.axihe.com/sql/sql-tutorial.html",
                      "image": "https://static.axihe.com/images/icon/sql.png"
                  },
                  {
                      "title": "Creating Your First Desktop App With HTML, JS and Electron",
                      "url": "https://www.axihe.com/js/js-tutorial.html",
                      "image": "https://static.axihe.com/images/icon/html.png"
                  }
              ]
          },
          computed: {
              // 计算数学,匹配搜索
              filteredArticles: function () {
                  var articles_array = this.articles,
                      searchString = this.searchString;
      
                  if(!searchString){
                      return articles_array;
                  }
      
                  searchString = searchString.trim().toLowerCase();
      
                  articles_array = articles_array.filter(function(item){
                      if(item.title.toLowerCase().indexOf(searchString) !== -1){
                          return item;
                      }
                  })
      
                  // 返回过来后的数组
                  return articles_array;;
              }
          }
      });
      </script>
      

      切换不同布局实例

      点击右上角的按钮来切换不同页面布局:

      <form id="main" v-cloak>
      
          <div class="bar">
      
              <!-- 两个按钮用于切换不同的列表布局 -->
      
              <a class="list-icon" v-bind:class="{ 'active': layout == 'list'}" v-on:click="layout = 'list'"></a>
              <a class="grid-icon" v-bind:class="{ 'active': layout == 'grid'}" v-on:click="layout = 'grid'"></a>
          </div>
      
          <!-- 我们设置了两套布局页面。使用哪套依赖于 "layout" 绑定 -->
      
          <ul v-if="layout == 'grid'" class="grid">
              <!-- 使用大图,没有文本 -->
              <li v-for="a in articles">
                  <a v-bind:href="a.url" target="_blank"><img v-bind:src="a.image.large" /></a>
              </li>
          </ul>
      
          <ul v-if="layout == 'list'" class="list">
              <!-- 使用小图及标题 -->
              <li v-for="a in articles">
                  <a v-bind:href="a.url" target="_blank"><img v-bind:src="a.image.small" /></a>
                  <p>{{a.title}}</p>
              </li>
          </ul>
      
      </form>
      <script>
      
          var demo = new Vue({
              el: '#main',
              data: {
                  // 视图模型,可能的值是 "grid" 或 "list"。
                  layout: 'grid',
      
                  articles: [{
                      "title": "HTML 教程",
                      "url": "https://www.axihe.com/html/html-tutorial.html",
                      "image": {
                          "large": "https://static.axihe.com/images/mix/htmlbig.png",
                          "small": "https://static.axihe.com/images/icon/html.png"
                      }
                  },
                  {
                      "title": "CSS 教程",
                      "url": "https://www.axihe.com/css/css-tutorial.html",
                      "image": {
                          "large": "https://static.axihe.com/images/mix/cssbig.png",
                          "small": "https://static.axihe.com/images/icon/css.png"
                      }
                  },
                  {
                      "title": "JS 教程",
                      "url": "https://www.axihe.com/js/js-tutorial.html",
                      "image": {
                          "large": "https://static.axihe.com/images/mix/jsbig.jpeg",
                          "small": "https://static.axihe.com/images/icon/js.png"
                      }
                  },
                  {
                      "title": "SQL  教程",
                      "url": "https://www.axihe.com/sql/sql-tutorial.html",
                      "image": {
                          "large": "https://static.axihe.com/images/mix/sqlbig.png",
                          "small": "https://static.axihe.com/images/icon/sql.png"
                      }
                  },
                  {
                      "title": "Ajax 教程",
                      "url": "https://www.axihe.com/ajax/ajax-tutorial.html",
                      "image": {
                          "large": "https://static.axihe.com/images/mix/ajaxbig.png",
                          "small": "https://static.axihe.com/images/icon/ajax.png"
                      }
                  },
                  {
                      "title": "Python 教程",
                      "url": "https://www.axihe.com/pyhton/pyhton-tutorial.html",
                      "image": {
                          "large": "https://static.axihe.com/images/mix/pythonbig.png",
                          "small": "https://static.axihe.com/images/icon/python.png"
                      }
                  }]
      
              }
          });
      
      </script>
      
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