vue实现增删改全选和数据持久化

    <div id="app" class="score-case">
      <div class="table">
        <table>
          <thead>
            <tr>
              <th>编号</th>
              <th>科目</th>
              <th>成绩</th>
              <th>操作</th>
            </tr>
          </thead>

          <tbody v-if="list.length > 0">
            <tr v-for="(item, index) in list" :key="item.id">
              <td>{{ index + 1 }}</td>
              <td>{{ item.subject }}</td>
              <!-- 需求：不及格的标红, < 60 分, 加上 red 类 -->
              <td :class="{ red: item.score < 60 }">{{ item.score }}</td>
              <td><a @click.prevent="del(item.id)" href="http://www.baidu.com">删除</a></td>
            </tr>
          </tbody>

          <tbody v-else>
            <tr>
              <td colspan="5">
                <span class="none">暂无数据</span>
              </td>
            </tr>
          </tbody>

          <tfoot>
            <tr>
              <td colspan="5">
                <span>总分：{{ totalScore }}</span>
                <span style="margin-left: 50px">平均分：{{ averageScore }}</span>
              </td>
            </tr>
          </tfoot>
        </table>
      </div>
      <div class="form">
        <div class="form-item">
          <div class="label">科目：</div>
          <div class="input">
            <input
              type="text"
              placeholder="请输入科目"
              v-model.trim="subject"
            />
          </div>
        </div>
        <div class="form-item">
          <div class="label">分数：</div>
          <div class="input">
            <input
              type="text"
              placeholder="请输入分数"
              v-model.number="score"
            />
          </div>
        </div>
        <div class="form-item">
          <div class="label"></div>
          <div class="input">
            <button @click="add" class="submit" >添加</button>
          </div>
        </div>
      </div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>

    <script>
      const app = new Vue({
        el: '#app',
        data: {
          list: [
            { id: 1, subject: '语文', score: 62 },
            { id: 7, subject: '数学', score: 89 },
            { id: 12, subject: '英语', score: 70 },
          ],
          subject: '',
          score: ''
        },
        computed: {
          totalScore() {
            return this.list.reduce((sum, item) => sum + item.score, 0)
          },
          averageScore () {
            if (this.list.length === 0) {
              return 0
            }
            return (this.totalScore / this.list.length).toFixed(2)
          }
        },
        methods: {
          del (id) {
            // console.log(id)
            this.list = this.list.filter(item => item.id !== id)
          },
          add () {
            if (!this.subject) {
              alert('请输入科目')
              return
            }
            if (typeof this.score !== 'number') {
              alert('请输入正确的成绩')
              return
            }
            this.list.unshift({
              id: +new Date(),
              subject: this.subject,
              score: this.score
            })

            this.subject = ''
            this.score = ''
          }
        }
      })
    </script>

<div class="main" v-if="fruitList.length > 0">
        <div class="table">
          <!-- 头部 -->
          <div class="thead">
            <div class="tr">
              <div class="th">选中</div>
              <div class="th th-pic">图片</div>
              <div class="th">单价</div>
              <div class="th num-th">个数</div>
              <div class="th">小计</div>
              <div class="th">操作</div>
            </div>
          </div>
          <!-- 身体 -->
          <div class="tbody">
            <div v-for="(item, index) in fruitList" :key="item.id" class="tr" :class="{ active: item.isChecked }">
              <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
              <div class="td"><img :src="item.icon" alt="" /></div>
              <div class="td">{{ item.price }}</div>
              <div class="td">
                <div class="my-input-number">
                  <button :disabled="item.num <= 1" class="decrease" @click="sub(item.id)"> - </button>
                  <span class="my-input__inner">{{ item.num }}</span>
                  <button class="increase" @click="add(item.id)"> + </button>
                </div>
              </div>
              <div class="td">{{ item.num * item.price }}</div>
              <div class="td"><button @click="del(item.id)">删除</button></div>
            </div>
          </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
          <!-- 全选 -->
          <label class="check-all">
            <input type="checkbox" v-model="isAll"/>
            全选
          </label>
          <div class="right-box">
            <!-- 所有商品总价 -->
            <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ totalPrice }}</span></span>
            <!-- 结算按钮 -->
            <button class="pay">结算( {{ totalCount }} )</button>
          </div>
        </div>
      </div>
      <!-- 空车 -->
      <div class="empty" v-else>🛒空空如也</div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      const defaultArr = [
            {
              id: 1,
              icon: 'http://autumnfish.cn/static/火龙果.png',
              isChecked: true,
              num: 2,
              price: 6,
            },
            {
              id: 2,
              icon: 'http://autumnfish.cn/static/荔枝.png',
              isChecked: false,
              num: 7,
              price: 20,
            },
            {
              id: 3,
              icon: 'http://autumnfish.cn/static/榴莲.png',
              isChecked: false,
              num: 3,
              price: 40,
            },
          ]
      const app = new Vue({
        el: '#app',
        data: {
          // 水果列表
          fruitList: JSON.parse(localStorage.getItem('list')) || defaultArr,
        },
        computed: {
          // 默认计算属性：只能获取不能设置，要设置需要写完整写法
          // isAll () {
          //   // 必须所有的小选框都选中，全选按钮才选中 → every
          //   return this.fruitList.every(item => item.isChecked)
          // }
          
          // 完整写法 = get + set
          isAll: {
            get () {
              return this.fruitList.every(item => item.isChecked)
            },
            set (value) {
              // 基于拿到的布尔值，要让所有的小选框 同步状态
              this.fruitList.forEach(item => item.isChecked = value)
            }
          },
          // 统计选中的总数 reduce
          totalCount () {
            return this.fruitList.reduce((sum, item) => {
              if (item.isChecked) {
                // 选中 → 需要累加
                return sum + item.num
              } else {
                // 没选中 → 不需要累加
                return sum
              }
            }, 0)
          },
          // 总计选中的总价 num * price
          totalPrice () {
            return this.fruitList.reduce((sum, item) => {
              if (item.isChecked) {
                return sum + item.num * item.price
              } else {
                return sum
              }
            }, 0)
          }
        },
        methods: {
          del (id) {
            this.fruitList = this.fruitList.filter(item => item.id !== id)
          },
          add (id) {
            // 1. 根据 id 找到数组中的对应项 → find
            const fruit = this.fruitList.find(item => item.id === id)
            // 2. 操作 num 数量
            fruit.num++
          },
          sub (id) {
            // 1. 根据 id 找到数组中的对应项 → find
            const fruit = this.fruitList.find(item => item.id === id)
            // 2. 操作 num 数量
            fruit.num--
          }
        },
        watch: {
          fruitList: {
            deep: true,
            handler (newValue) {
              // 需要将变化后的 newValue 存入本地 （转JSON）
              localStorage.setItem('list', JSON.stringify(newValue))
            }
          }
        }
      })
    </script>