setTimeout start, pause, stop function

Rendering:

 

Requirements: Click to play the hourly AQI data carousel, change the button to pause, click pause to stop polling, and change the button to play .

Code:

// setTimeout的集合(关键点哦) 
timer: [],
 
// 当前播放状态
isPlay: false,
 
// idnex
selectIndex: 0,
 
// 包含数据
tableData:[]

方法
        // 播放
        play() {
            // 先停止之前的播放序列
            this.stop();
            this.isPlay = true;
            // 重新(selectIndex)开始播放
            for (let i = this.selectIndex; i < this.tableData.length; i++) {
                const item = this.tableData[i];
 
                const a = setTimeout(() => {
                    if (this.isPlay) {
                        this.selectIndex = i;
                       
                        //  发布地图layer上播放第i个图片
                        window.eventBus.$emit(
                            events.ADD_BIZ_MAP_LAYER,
                            { data: i, layertype: CLOUD, status: `播放` }
                        );
                        // 如果是最后一条数据,则停止播放,选中index归为0
                        if (i === this.tableData.length - 1) {
                            this.stop();
                            this.selectIndex = 0;
                        }
                    }
                }, (i - this.selectIndex) * 1000);
                // 拿到当前setTimeout的集合
                this.timer.push(a);
            }
        },
        // 停止
        stop() {
            this.pause();
            // 发布当前的index下的图片,layer那边会设置为setOpacity(0)
            window.eventBus.$emit(
                events.ADD_BIZ_MAP_LAYER,
                { data: this.selectIndex, layertype: CLOUD, status: `暂停` }
            );
        },
        // 暂停
        pause() {
            // 播放状态改为false
            this.isPlay = false;
            // 清空之前的timer setTimeout的集合
            for (let i = 0; i < this.timer.length; i++) {
                const element = this.timer[i];
                clearTimeout(element);
            }
        },

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Origin blog.csdn.net/qq_26695613/article/details/128799589