markdown 滚动后元素可见时触发事件

Posted 2021-05-06

```javascript
function isScrolledIntoView(elem)
{
    //alert("method invoked");
    var docViewTop = $(window).scrollTop();
    var docViewBottom = docViewTop + $(window).height();
    var elemTop = $(elem).offset().top;
    var elemBottom = elemTop + $(elem).height();
    return ((elemBottom >= docViewTop) && (elemTop <= docViewBottom) && (elemBottom <=      docViewBottom) && (elemTop >= docViewTop));
}

window.addEventListener('scroll', function(e) {
    if( isScrolledIntoView('.about-complex-module__stats') ){
        // Do your stuff
    }
});
```