js 监听浏览器不滚动事件

添加定时器，每次滚动事件先清除上个定时器，再添加新的定时器，比如说，浏览器3秒没发生滚动，3秒后则会触发定时器回调事件，进而获取到没有滚动事件。

mounted() {
    window.addEventListener('scroll', this.handleScroll);
},
handleScroll() {
    const scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
    const titleTop = document.querySelectorAll('.c-panel-heading')[1].offsetTop;
    
    clearTimeout(countTimer);
    // 浏览器3秒内未滚动 则停止计时
    countTimer = setTimeout(this.isScrollEnd, 3000);
    this.taskPos.startScrollTop = parseInt(scrollTop);
},
isScrollEnd() {
    const scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
    this.taskPos.endScrollTop = parseInt(scrollTop);
    if (this.taskPos.startScrollTop === this.taskPos.endScrollTop) {
        // 获取到不滚动状态
       // 业务逻辑
        this.taskView.stopCountDown = true;
    }
},