<input type="text" name="text" onBlur="test();">
<script language="javascript">
function test()
{
alert(document.all('text').value.replace(/</g,"xxx"));
}
</script>
<script language="javascript">
function test()
{
alert(document.all('text').value.replace(/</g,"xxx"));
}
</script>
alert("将"+s+" 转换成"+s.replace(/</g,"<").replace(/>/g,">"));