div滚动条沉底

<div id="chatContent" class="chat">
</div>

<pre name="code" class="css">.chat {
background-color: #dcdde0;
box-sizing: border-box;
max-height: 6.1rem;
overflow: auto;
padding: 5px 8px;

/**js代码**/

<pre name="code" class="javascript">function scrollToBottom(){
var content = $("#chatContent");
content.scrollTop(content.get(0).scrollHeight);
}