}
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="rn 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();
}
}
// Deactivate Cloaking --></script>
第二步：在<body>区域中加入如下代码:
<form>
<table CELLSPACING="0" CELLPADDING="0" WIDTH="17%">
<tr>
<td width="100%" colspan="3" valign="top"><div align="center"><p><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>
