源码：
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
// Firefox, Google Chrome, Opera, Safari, Internet Explorer from version 9
function OnInput (event) {
alert ( event.target.value);
}
// Internet Explorer
function OnPropChanged (event) {
if (event.propertyName.toLowerCase () == "value") {
alert ( "123"+event.srcElement.value);
}
}
</script>
</head>
<body>
<textarea id="describeInput" placeholder=" 请输入故障描述" oninput="OnInput (event)" onpropertychange="OnPropChanged (event)" ></textarea>
</body>
</html>