14.3.6 文本域.html

javascript即用即差核心对象手册

<form>
    <textarea name="txt" onChange="getTxt()"></textarea>
	<input type="button" value="加长" onclick="document.forms[0].txt.cols+=1"><br>
	<input type="button" value="加高" onClick="document.forms[0].txt.rows+=1">
	<div id="info" ></div>
</form>
<script>
    var txta=document.forms[0].txt
	txta.value="这是一个文本域，单击相应按钮可以改变其大小";
	txta.focus();
	txta.select();
	function getTxt()
	{
	   var oid=document.getElementById("info");
	   oid.innerText=txta.innerText;
	}
</script>