Javascript 用字符串填充文本区域

我试图用java脚本中的字符串填充某个文本区域。我已经在函数中将字符串定义为变量“result”，并要求函数返回变量result。当它返回“result”时，我希望它在特定的文本区域中返回。因此，我使用document.getElementByID调用了文本区域，但它不会填充文本区域。我不确定我哪里做错了，或者从这里该往哪里走。任何帮助都将不胜感激。我已经包含了下面表单和函数的代码

JavaScript

function newVerse(form1) {
    var objects = form1.objects.value;
    var destination = form1.destination.value;
    var result = "Where have all the" + objects + "gone?" + "Long time passing." + "Where have all the" + objects + "gone?" + "Long time ago." + "Where have all the" + objects + "gone?" + "Gone to" + destination + ", everyone." + "When will they ever learn?" + "When will they ever learn?";
    document.getElementByID(textarea).value += result
    return result;
}

HTML

<form name=form1>Objects:
    <input type="text" name="objects">
    <br>Destination:
    <input type="text" name="destination">
    <br>
    <input type="button" name="submit" value="Submit" onclick="newVerse(form1)">
</form>

对象：

目的地：

我做了一个有效的例子

以下是您的错误：

Javascript HTML

物体：

目的地：

function newVerse(form1) { 
  var objects = form1.objects.value;
  var destination = form1.destination.value;
  var result = "Where have all the" + objects + "gone?" + "Long time passing." + "Where have all the" + objects + "gone?" + "Long time ago." + "Where have all the" + objects + "gone?" + "Gone to" + destination + ", everyone." + "When will they ever learn?" + "When will they ever learn?";

  //Missing quotes arround text area.
  //Missing ; althought is not necessary.
  //document.getElementByID(textarea).value += result
   document.getElementByID('textarea').value += result;
}

<form name=form1><!-- Missing "" around form1 -->
  Objects:
  <input type="text" name="objects"> <!-- Missing closing / -->
  <br>Destination:
  <input type="text" name="destination"> <!-- Missing closing / -->
  <br>
  <input type="button" name="submit" value="Submit" onclick="newVerse(form1)">
  <!-- You want to pass the actual form, so replace onclick="newVerse(form1)" by onclick="newVerse(document.forms['form1'])"-->
  <!-- Missing closing / -->
</form>