微信小程序Todolist demo

页面

  
  


  
  {
    {item.name}}
  X


  Toggle all{
    {num}} items clear completed

样式

view{
  margin: auto;
}
input{
  width: 400rpx;
}
image{
  width: 50rpx;
  height: 50rpx;
  margin-right: 10px;
}
.topbox{
  display: flex;
  padding: 5px 10px;
}
.bodys{
  text-align: center;
}
.footer{
  text-align: center;
  color: #c5c5c5;
}
.lines{
  text-decoration-line: line-through;
}
.dev{
  background-color: slategrey;
  border-radius: 50%;
}

js代码

// pages/TodoList/TodoList.js
Page({
  // 页面的初始数据

  data: {
    list: [{
        name: '不是我',
        eflag: false
      },
      {
        name: '就是你',
        eflag: true
      },
      {
        name: '真是他',
        eflag: false
      }
    ],
    lcdata: '',
    num: 0,
    searchinput:''

  },
  //获取input数据
  getlist(e) {
    console.log(e);
    this.setData({
      lcdata: e.detail.value
    })
    // console.log(this.data.lcdata);
  },
  //添加数据
  addlist(e) {
    console.log(e);
    let arr = {
      name: this.data.lcdata,
      eflag: false
    }
    // console.log(arr);
    this.data.list.push(arr);
    this.setData({
      list: this.data.list,
    });

    //置空
    this.setData({
      searchinput: '',
    })


    //数量变化
    this.setData({
      num: this.data.num + 1
    })

  },
  //删除数据
  remove(e) {
    console.log(e);
    let arr = e.currentTarget.dataset.index
    
    //数量变化
    if (this.data.list[arr].eflag == false) {
      this.data.num = this.data.num-1
      this.setData({
        num: this.data.num
      })
      console.log('减一');
    }else{
      this.setData({
        num: this.data.num 
      })
      console.log('不减');
    }

    this.data.list.splice(arr, 1);
    this.setData({
      list: this.data.list,
    });


  },
  //状态切换
  changeflag(e) {
    console.log(e);
    let ind = e.currentTarget.dataset.inde
    this.data.list[ind].eflag = !this.data.list[ind].eflag
    this.setData({
      list: this.data.list,
    })
    //数量变化
    if (this.data.list[ind].eflag == false) {
      this.setData({
        num: this.data.num + 1
      })
    } else {
      this.setData({
        num: this.data.num - 1
      })
    }

  },
  //全部清空
  allremove(){
    this.setData({
      list: [],
      num:0
    })
  },

  //初始渲染数据
  onReady: function () {
    //数量统计
    this.data.list.forEach(item => {
      if (item.eflag == false) {
        this.setData({
          num: this.data.num + 1
        })
      }
    })
  },
})

效果图