微信小程序全选多选效果实现代码解析

<view class="memberList">
 <view class="allSelect_box" bindtap='selectAll'>
  <checkbox class="checkbox" checked="{{selectilall}}"/>
  <text class="allSelect">全选</text>
 </view>
 <view wx:for="{{list}}">
  <view class="member_box" data-index="{{index}}" data-name="{{item.id}}" bindtap='select'>
   <checkbox class="checkbox" checked="{{item.checked}}"/>
   <image src="../../assets/img/user_img.jpg" mode="widthFix" class="avatar"></image>
   <view>
    <view class="applicant_name">汪小涵 <text>管理员</text> </view>
    <view class="approval_state">总监</view>
   </view>
  </view>
 </view>
</view>

.memberList{
 background:#fff;
 padding:0 35rpx 0 28rpx;
}
.allSelect_box{
 line-height:90rpx;
 border-bottom:1rpx solid #F5F5F5;
}
.checkbox{
 transform: scale(0.7,0.7);
}
.member_box .checkbox{
 margin-: 15rpx;
}
checkbox .wx-checkbox-input.wx-checkbox-input-checked {
 color:#fff;
 background: #6669e3;
 border-color:#6669e3;
}
.allSelect{
 margin-left:15rpx;
 vertical-align:middle;
}
.member_box{
 padding-bottom:30rpx;
 display: flex;
 border-bottom:2rpx solid #EBEBEB;
 padding:20rpx 0 20rpx 0;
}
.avatar{
 width:100rpx;
 border-radius:50%;
 margin-left:15rpx;
}
.applicant_name{
 font-size:34rpx;
 padding:0 0 15rpx 30rpx;
}
.applicant_name text{
 color:#fff;
 background:#6669e3;
 font-size:28rpx;
 padding:5rpx 10rpx;
 border-radius:10rpx;
 margin-left:15rpx;
}
.approval_state{
 color:#8D8D8D;
 font-size:28rpx;
 padding-left: 30rpx;
}

data: {
  list: [
   { id: 1, name: 1, checked: false },
   { id: 2, name: 2, checked: false },
   { id: 3, name: 3, checked: false },
   { id: 4, name: 4, checked: false },
  ],
  selectilall: false
 },

//单选
 select: function (e) {
  let selectValue = e.currentTarget.dataset.name
  let index = e.currentTarget.dataset.index;
  let list = this.data.list
  let newli = 'list[' + index + '].checked';
  this.setData({
   [newli]: !this.data.list[index].checked
  })
  let num = 0;
  for(var i=0;i<this.data.list.length;i++){
   if(this.data.list[i].checked){
    num++;
   }
  }
  if(num == this.data.list.length){
   this.setData({
    selectilall: true
   })
  }else{
   this.setData({
    selectilall: false
   })
  }
 },
 //全选，取消全选
 selectAll: function (e) {
  let list = this.data.list;
  let selectilall = this.data.selectilall;
  if (selectilall == false) {
   for (let i = 0; i < list.length; i++) {
    let newli = 'list[' + i + '].checked';
    this.setData({
     [newli]: true,
     selectilall: true
    })
   }
  } else {
   for (let i = 0; i < list.length; i++) {
    let newli = 'list[' + i + '].checked';
    this.setData({
     [newli]: false,
     selectilall: false
    })
   }
  }
 }