uni-app之scroll的triggered作用

关于 uni-app之scroll 的 下拉刷新 和 上拉加载，理解其中triggered的作用。

<template>
    <view class="base_box">
        <scroll-view class="scroll_box" scroll-y :refresher-triggered="triggered" :refresher-enabled="true" @refresherrefresh="onRefreshPage"
         refresher-background="#666666" @scrolltolower="onRequestMore" @refresherrestore="onRestore">
            <view v-if="dataList.length > 0" class="list_box">
                <view class="list_item" v-for="(item, i) in dataList" :key="i">
                    <text style="color: #333333;">{{'--- --- ' + i + ' --- ---'}}</text>
                </view>
                <view style="width: 710rpx;height: 60rpx; line-height: 60rpx;text-align: center;color: #333333;">{{loadStatus}}</view>
            </view>
            <view v-if="dataList.length == 0" class="list_box_none">
                <view class="data-none">
                    <!-- <image src="/static/images/none.jpg" mode="aspectFill"></image> -->
                </view>
            </view>
        </scroll-view>
    </view>
</template>

<script>
    export default {
        data() {
            return {
                dataList: [],
                pageInfo: {
                    /* totalCount 总项数 */
                    // totalCount: 0,
                    /* pageCount 总页数 */
                    // pageCount: 0,
                    /* pageSize 一页请求的项数 */
                    pageSize: 10,
                    /* currPageIndex 当前页码： 若从1开始 则赋值为0；若从0开始 则赋值为-1 ... */
                    currPageIndex: 0,
                },
                /* triggered的作用：
                  (1) true -> false  此时若scroll存在顶部偏移，则可触发偏移消失。
                  (2) false -> true  此时若scroll没有顶部偏移，则可触发偏移出现以及下拉刷新事件。 */
                triggered: false,
                /* loadStatus的取值： loadmore \ onmore */
                loadStatus: "loadmore",
            };
        },
        onLoad(option) {
            console.log("track_onLoad.");
            // this._freshing = false; // I think it should be deleted.
            setTimeout(() => {
                console.log("track_onLoad_2.");
                this.triggered = true;
            }, 200);
        },
        onShow() {},
        computed: {},
        methods: {
            onRestore() {
                console.log("track_onRestore.");
            },
            onRefreshPage() {
                console.log("track_onRefreshPage.");
                if (this._freshing) {
                    return;
                }
                console.log("track_onRefreshPage_1.");
                this._freshing = true;
                if (!this.triggered) {
                    this.triggered = true;
                }
                this.pageInfo.currPageIndex = 0;
                this.requestDataList(() => {
                    this.triggered = false;
                    this._freshing = false;
                });
            },
            onRequestMore() {
                console.log("track_onRequestMore.");
                if (this._freshing) {
                    return;
                }
                console.log("track_onRequestMore_1.");
                this._freshing = true;
                this.requestDataList(() => {
                    this._freshing = false;
                });
            },
            async requestDataList(callback) {
                console.log("track_requestDataList.");
                let cachePageIndex = this.pageInfo.currPageIndex + 1;
                // 利用 延迟执行 模拟 数据请求过程。
                setTimeout(() => {
                    if (cachePageIndex - this.pageInfo.currPageIndex == 1) {
                        console.log("track_requestDataList_data_ok.");

                        // 模拟处理数据。
                        if (1 == cachePageIndex) {
                            this.dataList = [];
                        }
                        this.dataList = this.dataList.concat([{}, {}, {}, {}, {}, {}]);

                        this.pageInfo.currPageIndex = cachePageIndex;
                    } else {
                        console.log("track_requestDataList_data_discard.");
                    }
                    if (typeof callback == 'function') {
                        callback();
                    }
                    console.log("track_requestDataList_end.");
                }, 6000);
                console.log("track_requestDataList_1.");
            },
        }
    };
</script>

<style>
    .base_box {
        padding-top: 168rpx;
        background-color: #F7F7F7;
    }

    .scroll_box {
        width: 750rpx;
        height: 960rpx;
        background-color: #EEEEEE;
    }

    .list_box {
        width: 750rpx;
    }

    .list_item {
        margin: 20rpx 20rpx 0rpx 20rpx;
        width: 710rpx;
        height: 300rpx;
        background-color: #999999;
    }
</style>

参考链接： https://blog.csdn.net/qq_40666120/article/details/108284680