使用vue2的filter过滤列表

组件部分

<template>
  <div class="todo-contain">
    <h1>TODOS</h1>
    <div class="todolist-contain">
      <header>
        <nav>
          <a v-for="(item,index) in tabListMap" :key="index" :class="currentTabKey==index ? 'active':''" @click="changeTab(index)">
            {{item}}
          </a>
        </nav>
        <div class="todo-add">
          <input type="text" ref="addInput" v-model="addTodoText" placeholder="请输入待办事项" />
          <button @click="handleAddTodo()">添加</button>
        </div>
        <span class="todo-count">{{totalTodoCount}}个待办</span>
      </header>
      <div class="todo-list">
        <ul>
          <li v-for="(item ,index) in filterTodoList" :key="index" :class=" (item.checked && currentTabKey!='done') ?'done':''">
            <label>
              <template v-if="item.status!='done' && currentTabKey!='done'">
                <input type="checkbox" :value="item.id" v-model="item.checked" />
              </template>
              {{item.title}}
            </label>
          </li>
        </ul>
      </div>
    </div>
  </div>
</template>
<script>
export default {
  name: 'TodoList2',
  props: {
    todoListData: {
      default: []
    }
  },
  data() {
    return {
      todoListData_: {},
      tabListMap: {
        all: '全部',
        todo: '待办',
        doing: '进行中',
        done: '已完成'
      },
      currentTabKey: 'all',
      addTodoText: ''
    }
  },
  created() {
    this.todoListData_ = [...this.todoListData] //深拷贝
  },
  computed: {
    filterTodoList: function() {
      var key = this.currentTabKey
      var todoListData_ = this.todoListData_
      return todoListData_.filter(function(item) {
        if (key === 'all') {
          return item
        } else if (key === 'done') {
          return item.status == key || item.checked == true
        } else {
          return item.status == key
        }
      })
    },
    totalTodoCount() {
      var count = 0
      this.todoListData_.forEach(function(item, index) {
        if (item.status === 'todo' && item.checked !== true) {
          count++
        }
      })
      return count
    }
  },
  methods: {
    changeTab(selectedTab) {
      this.currentTabKey = selectedTab
    },
    handleAddTodo() {
      var newData = {
        title: this.addTodoText,
        status: 'todo'
      }
      this.todoListData_.unshift(newData) //从头加入
      this.addTodoText = '' //清空添加输入框
    }
  }
}
</script>

<style>
html,
body {
  background: #f5f5f5;
  margin: 0;
  padding: 0;
}
ul,
li {
  margin: 0;
  padding: 0;
}
a {
  cursor: pointer;
}
.todo-contain {
  width: 500px;
  margin: 0 auto;
}
.todo-contain h1 {
  font-size: 60px;
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  color: #ecd7d7;
  line-height: 60px;
  margin-bottom: 10px;
}
.todolist-contain {
  border: 1px solid #ccc;
  background: #fff;
}
.todolist-contain header {
  position: relative;
}
.todolist-contain nav {
  text-align: center;
  padding: 5px 0;
  border-bottom: 1px solid #e5e5e5;
}
.todolist-contain nav a {
  display: inline-block;
  padding: 3px 10px;
  font-size: 14px;
  color: #94786e;
  text-decoration: none;
}
.todolist-contain nav a.active {
  border: 1px solid #ecd7d7;
  border-radius: 5px;
}
.todo-count {
  position: absolute;
  left: 10px;
  top: 8px;
  font-size: 14px;
}
.todo-add {
  padding: 5px 0;
  border-bottom: 1px solid #e5e5e5;
}
.todo-add input {
  border: 0 none;
  font-size: 24px;
  padding: 5px 15px;
  width: 400px;
}
.todo-add button {
  border: 0 none;
  background: #2695ee;
  color: #fff;
  border-radius: 5px;
  font-size: 16px;
  padding: 5px 10px;
  cursor: pointer;
}
.todo-list li {
  list-style: none;
  border-bottom: 1px solid #e5e5e5;
  font-size: 24px;
  padding: 10px 10px 10px 50px;
  position: relative;
  color: #534d4e;
}
.todo-list li input {
  width: 40px;
  height: 40px;
  position: absolute;
  left: 0;
  top: 3px;
  background: none;
  -webkit-appearance: none;
  appearance: none;
}
.todo-list li input:focus {
  outline: none;
}
.todo-list li input:after {
  content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="-10 -18 100 135"><circle cx="50" cy="50" r="50" fill="none" stroke="#ededed" stroke-width="3"/></svg>');
  display: block;
}
.todo-list li input:checked:after {
  content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="-10 -18 100 135"><circle cx="50" cy="50" r="50" fill="none" stroke="#bddad5" stroke-width="3"/><path fill="#5dc2af" d="M72 25L42 71 27 56l-4 4 20 20 34-52z"/></svg>');
}
.todo-list li.done {
  font-style: italic;
  color: #dadbdb;
  text-decoration: line-through;
}
.todo-list li:last-child {
  border-bottom: 0;
}
</style>

app.vue

<template>
  <div id="app">
    <TodoList :todoListData="todoListData"></TodoList>
  </div>
</template>

<script>
import TodoList from './components/todoList/TodoList'
export default {
  name: 'App',
  components: {
    TodoList
  },
  data() {
    return {
      todoListData: {
        todo: [
          {
            id: 1,
            title: 'todo 1'
          },
          {
            id: 2,
            title: 'todo 2'
          },
          {
            id: 3,
            title: 'todo 3'
          },
          {
            id: 4,
            title: 'todo 4'
          }
        ],
        doing: [
          {
            id: 1,
            title: 'doing 1'
          },
          {
            id: 2,
            title: 'doing 2'
          },
          {
            id: 3,
            title: 'doing 3'
          },
          {
            id: 4,
            title: 'doing 4'
          }
        ],
        done: [
          {
            id: 1,
            title: 'done 1'
          },
          {
            id: 2,
            title: 'done 2'
          },
          {
            id: 3,
            title: 'done 3'
          },
          {
            id: 4,
            title: 'done 4'
          }
        ]
      },
      todoListData2: [
        {
          id: 1,
          title: 'todo 1',
          status: 'todo'
        },
        {
          id: 2,
          title: 'todo 2',
          status: 'todo'
        },
        {
          id: 3,
          title: 'todo 3',
          status: 'todo'
        },
        {
          id: 4,
          title: 'todo 4',
          status: 'todo'
        },
        {
          id: 1,
          title: 'doing 1',
          status: 'doing'
        },
        {
          id: 2,
          title: 'doing 2',
          status: 'doing'
        },
        {
          id: 3,
          title: 'doing 3',
          status: 'doing'
        },
        {
          id: 4,
          title: 'doing 4',
          status: 'doing'
        },
        {
          id: 1,
          title: 'done 1',
          status: 'done'
        },
        {
          id: 2,
          title: 'done 2',
          status: 'done'
        },
        {
          id: 3,
          title: 'done 3',
          status: 'done'
        },
        {
          id: 4,
          title: 'done 4',
          status: 'done'
        }
      ]
    }
  }
}
</script>

<style lang="less" scoped>
@label-width: 200px;
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: #2c3e50;
  margin-top: 60px;
}
.logo {
  text-align: center;
}
.row {
  margin-bottom: 24px;
  vertical-align: top;
  zoom: 1;

  &__label,
  &__content {
    font-size: 14px;
  }
  &__label {
    width: @label-width;
    text-align: right;
    vertical-align: middle;
    float: left;
    color: #515a6e;
    line-height: 1;
    padding: 10px 12px 10px 0;
    box-sizing: border-box;
  }
  &__content {
    margin-left: @label-width;
    position: relative;
    line-height: 32px;
  }
}
</style>