源于 https://ask.csdn.net/questions/7759861 进行了简化。

效果

代码

index.js

Page({
  data: {
    // 待办列表
    todoList: [
      {
        thing: '洗衣服',
        completed: false
      },
      {
        thing: '刷鞋',
        completed: false
      },
      {
        thing: '写代码',
        completed: false
      }
    ],
    // 待办事务
    todoThing: ""
  },
  // 待办点击
  todoClick(e) {
    // 从wxml传入的点击的索引
    let index = e.currentTarget.dataset.index;
    this.setData({
      // 通过索引进行更改条目
      [`todoList[${index}].completed`]: !this.data.todoList[index].completed
    })
  },
  // 待办输入
  todoThingInput(e) {
    this.setData({ todoThing: e.detail.value })
  },
  // 添加按钮
  addClick() {
    this.setData({
      // 再数组最后追加一条
      [`todoList[${this.data.todoList.length}]`]: {
        thing: this.data.todoThing,
        completed: false
      },
      // 新增后清空输入框
      todoThing: ''
    })
  },
  // 删除按钮
  deleteClick(e) {
    // 从wxml传入的点击的索引
    let index = e.currentTarget.dataset.index;
    // 删除todoList索引为index的条目
    this.data.todoList.splice(index, 1)
    this.setData({
      // 对数组重新赋值
      todoList: this.data.todoList
    })
  }
})

index.wxml

<wxs module="tools">
  module.exports.getProgress = function (todo) {
    var length = todo.length;
    var checked = 0;
    for (var i = 0; i < todo.length; i++) {
      if (todo[i].completed) {
        checked++;
      }
    }
    return '完成度:' + (checked / length * 100).toFixed(2) + '%'
  }
</wxs>
<view class="todo-completion">{{tools.getProgress(todoList)}}</view>
<view class="todo-list">
  <view class="todo-item" wx:for="{{todoList}}" wx:key="unique" bindtap="todoClick" data-index="{{index}}">
    <!-- 点击条目增加删除线 -->
    <view class="todo-form-label {{item.completed?'delete-line':''}}">
      <radio checked="{{item.completed}}" /> {{item.thing}}
    </view>
    <!-- catchtap阻止冒泡并绑定事件 -->
    <view class="todo-delete" catchtap="deleteClick" data-index="{{index}}">删除</view>
  </view>
</view>
<view class="todo-form">
  <!-- bindconfirm  点击完成按钮时触发 -->
  <input class="form-item" type="text" placeholder="请输入想要做的事情" value="{{todoThing}}" bindinput="todoThingInput" bindconfirm="addClick" />
  <button type="primary" bindtap="addClick">添加</button>
</view>

index.wxss

.todo-form {
  padding: 20rpx 60rpx;
}

.todo-form .form-item {
  margin-bottom: 40rpx;
  font-size: 36rpx;
}

.todo-item .todo-form-label {
  /*