JavaScript数组应用 可依次读取的公告栏文字

答案：
<title>JavaScript数组文字</title> 
<script language="JavaScript"> 
var i = 0; 
var TextNumber = -1; 
var TextInput = new Object(); 
var HelpText=""; 
var Text = ""; 
var Speed=50; 
var message=0; 
var addPadding="\r\n"; 
TextInput[0] = "脚本之家庆祝日！"; 
TextInput[1] = "脚本之家感谢广大朋友多年来的支持……"; 
TextInput[2] = "我们将一如继往继续为大家奉献更好的源码资源！"; 
TotalTextInput = 2; // (0, 1, 2) 
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; 
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(); 
} 
} 

function teletype() 
{ 
if (TimerSet) 
{ 
Text=rollMessage(); 
TimerId = setTimeout("teletype()", Speed); 
document.forms[0].elements[0].value=Text; 
} 
} 

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); 
} 

function initTeleType() 
{ 
Text="\r\n Manual Tele-Type Display"; 
document.forms[0].elements[0].value=Text; 
} 

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="420"> 
<tr> 
<td width="100%" colspan="3" valign="top"><div align="center"><textarea NAME="teletype" ROWS="3" COLS="49" wrap="yes"></textarea> </td> 
</tr> 
<tr align="center"> 
<td width="30%" bgcolor="#0000A0" valign="top"><input TYPE="text" value="共3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>

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