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<div style="width:100%;height:200px;background: #1B9A59;overflow: scroll;" id="div">
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</div>
<script>
var div = document.getElementById('div');
console.log(div)
div.addEventListener("scroll", function () {
console.log('------------------')
console.log('scrollHeight',div.scrollHeight)//该元素总高度（包括隐藏的部分）
console.log('clientHeight',div.clientHeight)//该元素的可见高度
console.log('scrollTop',div.scrollTop)//该元素顶部隐藏了的高度
console.log('------------------')
//判断如果scrollTop == scrollHeight - clientHeight 那么就是触底了，加载新内容到页面中
})
</script>
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