阅读式公告栏

<script type="text/javascript">
 var TextNumber = 0;
 // used to track position in message
 var i = 0;
 // used to cycle thru messages var TextNumber = -1;
 // array of messages
 var TextInput = new Object();
 // used to load manipulate message
 var HelpText = "";
// used to load message
var Text = "";
// length of timeout (smaller is faster)
var Speed=50;
// used to display message number
var message=0;
// used to position text in ver 2.0
var addPadding="/r/n";
// Each element of TextInput represents a single message.
TextInput[0] = "消息1";
TextInput[1] = "消息2";
TextInput[2] = "消息3";
TextInput[3] = "消息4";
TextInput[4] = "消息5";
TextInput[5] = "消息6";
TextInput[6] = "消息7";
TextInput[7] = "消息8";
TotalTextInput = 7;
// (0, 1, 2, 3, 4, 5, 6, 7)
// Positioning and speed vary between versions.
var Version = navigator.appVersion;
if (Version.substring(0, 1)==3) { Speed=200; addPadding="";
 }
 for (var addPause = 0; addPause <= TotalTextInput; addPause++)
 {
 	TextInput[addPause] = addPadding + TextInput[addPause];
 }
 var TimerId
 var TimerSet = false;
 // Called by >>> button (display next message) . 

 function nextMessage()
 {
 	if (!TimerSet)
 	{
 		TimerSet = true;
 		clearTimeout(TimerId);
 		if (TextNumber >= TotalTextInput)
 		{
 			alert("This is the end of the list!");
 			TimerSet = false;
 		}
 		else
 		{
 			TextNumber += 1;
 			message = TextNumber + 1;
 			document.forms[0].elements[2].value = message;
 			Text = TextInput[TextNumber];
 			HelpText = Text;
 		}
 		teletype();
 	}
 }
 // Gets and displays character from rollMessage() .
 // Variable Speed controls length of timeout and thus the speed of typing. 

 function teletype()
 {
 	if (TimerSet)
 	{
 		Text = rollMessage();
 		TimerId = setTimeout("teletype()", Speed);
 		document.forms[0].elements[0].value = Text;
 	}
 }
 // Pulls one character at a time from string and returns (as Text) to function teletype() for displaying. 

 function rollMessage()
 {
 	i++;
 	var CheckSpace = HelpText.substring(i - 1, i);
 	CheckSpace = "" + CheckSpace;
 	if (CheckSpace == "")
 	{
 		i++;
 	}
 	if (i >= HelpText.length + 1)
 	{
 		TimerSet = false;
 		Text = HelpText.substring(0, i);
 		i = 0;
 		return (Text);
 	}
 	Text = HelpText.substring(0, i);
 	return (Text);
 }
 // Initially called by onLoad in BODY tag to load title. 

 function initTeleType()
 {
 	Text = "/r/n Manual Tele - Type Display";
 	document.forms[0].elements[0].value = Text;
 }
 // Called by <<< button (get previous message). 

 function lastMessage()
 {
 	if (!TimerSet && TextNumber != -1)
 	{
 		TimerSet = true;
 		clearTimeout(TimerId);
 		if (TextNumber <= 0)
 		{
 			alert("This is the beginning of the list!");
 			TimerSet = false;
 		}
 		else
 		{
 			TextNumber -= 1;
 			message = TextNumber + 1;
 			document.forms[0].elements[2].value = message;
 			Text = TextInput[TextNumber];
 			HelpText = Text;
 		}
 		teletype();
 	}
 }
</script>
<form>
	<table cellspacing="0" cellpadding="0" width="17%">
	<tr>
		<td width="100%" colspan="3" valign="top">
			<textarea name="teletype" rows="3" cols="28" wrap="yes"></textarea>
		</td>
	</tr>
	<tr align="center">
		<td width="40%" valign="top" bgcolor="#0000A0">
			<input type="button" value="公告栏" onclick="lastMessage()">
		</td>
		<td width="30%" bgcolor="#0000A0" valign="top">
			<input type="text" value="共8条" size="5" name="1">
		</td>
		<td width="30%" bgcolor="#0000A0" valign="top">
			<input type="button" value="阅' 读" onclick="nextMessage()">
		</td>
	</tr>
	</table>
</form>