【报Bug】picker-view 放在 uni-popup中 关闭pop 也会触发 picker-view的 change函数

测试代码如下:
①pick-view 定义:

<template name="WeightPicker">  
    <view class="weight">  
        <view class="weight-title">  
            <text @tap="closePop()">取消</text>  
            <text @tap="ensureSelected()">确定</text>  
        </view>  
        <picker-view v-if="visible" :indicator-style="indicatorStyle" :value="value" @change="bindChange">  
            <picker-view-column>  
                <view class="weight-item" v-for="(item,index) in weights" :key="index">{{item}} kg</view>  
            </picker-view-column>  
        </picker-view>  
    </view>  
</template>  

<script>  
    export default {  
        name: 'WeightPicker',  
        data() {  
            return {  
                weightStart: 30,  
                weightEnd: 150,  
                weights: [],  
                weight: 0,  
                value: [30],  
                visible: true,  
                indicatorStyle: 'height: ${Math.round(uni.getSystemInfoSync().screenWidth/(950/100))}px;'  
            }  
        },  
        methods: {  
            // 绑定滑动  
            bindChange(e) {  
                let val = e.detail.value  
                this.weight = this.weights[val[0]];  
            },  
            //数据初始化  
            initData() {  
                for (let i = this.weightStart; i <= this.weightEnd; i++) {  
                    this.weights.push(i);  
                }  
            },  
            // 关闭弹窗  
            closePop() {  
                this.$emit("close");  
            },  
            // 确定选择  
            ensureSelected() {  
                this.$emit("weight", this.weight == 0 ? 60 : this.weight);  
            }  
        },  
        created() {  
            this.initData();  
        }  
    }  
</script>

②uni-popup 使用:

<uni-popup ref="weight_popup" type="bottom">  
            <weight-picker v-on:weight="weightSelected()" v-on:close="closeWeightPopup()"></weight-picker>  
        </uni-popup>

③关闭pop

this.$refs.weight_popup.close();

关闭时如果 绑定的change事件函数中 val数组中某一项不为0 会多次触发该函数 次数与val中不为0的项数一致 这是为什么？