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javascript 中的异常处理

2006-04-12 16:46 387 查看
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>测试javascript中的trycatchfinally</title>

<script language="javascript">
<!--
function initException(Num,Msg)//define an Exception(define an new object)
{
this.ErrorNumber=Num;//error's number
this.ErrorMessage=Msg;//error's message
}
function CreateException()
{
ex=new initException(1,"Created!");//create the excepion (create an new instance of initException)
throw ex;//throw ex
}
function test()
{
try
{
CreateException();
}
catch(ex)//catch the ex
{
if(ex instanceof initException)//if the exception is our target,do something
{
alert(ex.ErrorNumber+ex.ErrorMessage);
}
else//else throw again
{
throw ex;
}
}
finally
{
alert("end");//do something finally
}
}
-->
</script>

</head>

<body>
<form>
<input type="button" name="testbutton" value="testbutton" onClick="test()">
</form>
</body>
</html>
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