问如何将文本区域滚动条设置为默认设置为底部？

EN

var textarea = document.getElementById('textarea_id');
textarea.scrollTop = textarea.scrollHeight;

$(document).ready(function(){
    var $textarea = $('#textarea_id');
    $textarea.scrollTop($textarea[0].scrollHeight);
});

<textarea id="logTextArea" style="width:600px;height:200px;"></textarea>

<script language="javascript">

    function loadLog(logValue) {
        logTa = document.getElementById("logTextArea")
        logTa.value = logValue;
        scrollLogToBottom()
    }

    function scrollLogToBottom() {
        logTa = document.getElementById("logTextArea")
        logTa.scrollTop = logTa.scrollHeight;
    }

    loadLog("This is my really long text block from a file ... ")

</script>