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| /**
| * 数据加载状态监听
| * 重写_fetchData函数，添加自定义网络获取逻辑
| * 调用_startLoad函数开始加载，_loadMore函数加载更多
| * @param loadStatus 0: 加载完成; 1: 加载中; 2: 已全部加载; 3: 加载失败;
| */
| export const useLoading = Behavior({
| data: {
| cPage: 1,
| tPage: 1,
| perPage: 10,
| totalCount: 0,
| loadStatus: 0,
| pageLoading: false,
| needLoadMore: false,
| timeout: false,
| },
| timeoutId: '',
| lastLoadStatus: 0,
| methods: {
| _startLoad() {
| wx.pageScrollTo({
| scrollTop: 0,
| });
| wx.stopPullDownRefresh();
| this.setData({
| cPage: 1,
| pageLoading: true,
| });
| this._loading();
| this._fetch();
| },
|
| _loadMore() {
| let { cPage, tPage } = this.data;
| if (cPage < tPage) {
| cPage++;
| this.setData({ cPage });
| this._loading();
| this._fetch();
| }
| },
|
| _pageLoadDone() {
| this.setData({ pageLoading: false });
| },
|
| _loadDone() {
| clearTimeout(this.timeoutId);
| this.setData({ loadStatus: 0 });
| },
|
| _loading() {
| if (this.data.lastLoadStatus != 1) {
| this.lastLoadStatus = 1;
| this.setData({ loadStatus: 1 });
| clearTimeout(this.timeoutId);
| this.timeoutId = setTimeout(() => {
| this.setData({
| loadStatus: 3,
| timeout: true,
| });
| console.log('timeout');
| }, 10000);
| }
| },
|
| _loadEnd() {
| clearTimeout(this.timeoutId);
| this.setData({ loadStatus: 2 });
| },
|
| _loadFail() {
| clearTimeout(this.timeoutId);
| this.setData({ loadStatus: 3 });
| },
|
| _setPagination(cPage, tPage, totalCount) {
| this.setData({ cPage, tPage, totalCount });
| },
|
| _fetch() {
| if (typeof this._fetchData === 'function') {
| const promise = this._fetchData(this.data.cPage);
| if (!promise) return;
| promise
| .then(head => {
| if (head) {
| let cPage = head.currentPage ? parseInt(head.currentPage) : parseInt(head.page);
| let tPage = parseInt(head.totalPage);
| let totalCount = head.totalCount ? parseInt(head.totalCount) : 0;
| this._setPagination(cPage, tPage, totalCount);
| cPage < tPage ? this._loadDone() : this._loadEnd();
| } else {
| this._loadEnd();
| }
| })
| .catch(err => {
| console.log(err);
| this._loadFail();
| })
| .finally(() => {
| this._pageLoadDone();
| });
| }
| },
|
| /**
| * 在使用时重写此函数，编写网络获取函数
| * @param {Number} cPage 当前分页
| */
| _fetchData(cPage) {
| return new Promise();
| },
| },
| });
|
|
