如果您想要滾動到總可滾動距離的中點，那么您將需要自己手動計算像素值。clientHeight元素的可滾動高度只是其和之間的差異scrollHeight。這些屬性在 HTML 元素本身上是可用的，所以我們需要首先使用 獲取它$('#sc')[0]，它返回 DOM 節點：
$("button").on("click", function(){
var sc = $('#sc')[0];
var scrollableHeight = sc.scrollHeight - sc.clientHeight;
$('#sc').animate({ scrollTop: 0.5 * scrollableHeight }, 1);
});
請參閱概念驗證示例：
$("button").on("click", function(){
var sc = $('#sc')[0];
var scrollableHeight = sc.scrollHeight - sc.clientHeight;
$('#sc').animate({ scrollTop: 0.5 * scrollableHeight }, 1);
});
#sc {
background: khaki;
width: 400px;
height: 200px;
position: relative;
margin:20px;
padding:0px;
overflow:hidden;
overflow-y: auto;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button>Scrool 50%</button>
<div id="sc">
<p>
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</p>
</div>
