方法一：提交按钮为button，处理click事件。验证正确，提交表单
<HTML>
<HEAD>
<TITLE>OSGi Dictionary Query Demo</TITLE>
<meta http-equiv="Content-Type" content="text/html;charset=GBK" />
<script>
function queryWord(){
if(document.frmCalc.query_word.value==""){
alert("必须输入单词");
document.frmCalc.word.focus();
return;
}
document.frmCalc.submit();
}
</script>
</HEAD>
<BODY>
<table style="width:100px;border:1px solid;height:100px">
<form name=frmCalc method="post" action="/demo/dictquery">
<tr bgcolor="#C0C0C0">
<td colspan="4" align="center">DictQuery示例</td>
</tr>
<tr>
<td><input type="text" name="query_word" size="20"></td>
<td><input type=button name=btnSubmit value="查询" onclick="queryWord();"></td>
</tr>
</form>
</table>
</BODY>
</HTML><HTML>
<H
