uniapp的checkbox多选框限制最大选择数量

直接上代码，复制粘贴就可以看效果

<template>
    <view>
        <checkbox-group @change="checkboxChange">
            <view v-for="(item, ind) in optionList" :key="item.id" class="selectItem" style="">
                <view style="float: left;" v-if="(maxSelect > 0 &&maxSelect ==Object.keys(selectedItem).length)">
                    <checkbox @click="checkboxTips()" :disabled="item.name|selectName" :value="item.name" />
                </view>
                <view style="float: left;" v-else>
                    <checkbox :value="item.name" />
                </view>
                <view>{{item.name}}</view>
            </view>
        </checkbox-group>
    </view>
</template>

<script>
    let thatOne;
    export default {
        data() {
            return {
                selectedItem: {},
                maxSelect: 2,
                optionList: [{
                        id: 1,
                        name: "小英"
                    },
                    {
                        id: 2,
                        name: "小张"

                    },
                    {
                        id: 3,
                        name: "小红"
                    },
                    {
                        id: 4,
                        name: "小明"

                    }
                ],
            }
        },
        beforeCreate: function() {
            thatOne = this;
        },
        filters: { //设置最大可选
            selectName(name) {
                if (thatOne.maxSelect > 0 &&
                    thatOne.maxSelect == Object.keys(thatOne.selectedItem).length) {
                    for (var t in thatOne.selectedItem) {
                        if (t == name) {
                            return false
                        }
                    }
                    return true
                } else {}
                return false
            },
        },
        methods: {
            checkboxTips() {//多选提示
                if (
                    thatOne.maxSelect == Object.keys(thatOne.selectedItem).length) {
                    uni.showToast({
                        title: "做多选择" + thatOne.maxSelect + "项",
                        icon: "none"
                    })

                }
            },

            //多选
            checkboxChange: function(evt) {
                var objectA = {}
                var arr = []
                for (let i = 0; i < this.optionList.length; i++) {
                    for (let j = 0; j < evt.target.value.length; j++) {
                        if (this.optionList[i].name === evt.target.value[j]) {
                            var objectB = this.optionList[i];
                            this.$set(objectA, evt.target.value[j], objectB)
                            arr.push(this.optionList[i].id)
                            break;
                        }
                    }
                }
                this.selectedItem = objectA;
            },
        }
    }
</script>

<style scoped>
    .selectItem {
         100%;
        margin-left: 30upx;
        margin-top: 50upx;
    }
</style>

效果