18. Web pages are not cached
HTM Web page
<meta http-equiv= "Pragma" content= "No-cache" >
<meta http-equiv= "Cache-control" content= "No-cache,
Must-revalidate ">
<meta http-equiv= "Expires" content= "Wed, Feb 1997
08:21:57 GMT ">
or <meta http-equiv= "expires" content= "0" >
ASP Web page
Response.Expires =-1
Response.ExpiresAbsolute = Now ()-1
Response.CacheControl = "No-cache"
PHP Web page
Header ("Expires:mon, June June 1997 05:00:00 GMT");
Header ("Cache-control:no-cache, must-revalidate");
Header ("Pragma:no-cache");
19. Check whether a string of strings is all composed of numbers
<script language= "Javascript" ><!--
function Checknum (str) {return Str.match (/\d/) ==null}
Alert (Checknum ("1232142141"))
Alert (Checknum ("123214214A1"))
--></script>
20. Get the size of a window
Document.body.clientwidth,document.body.clientheight
21. How to judge whether it is a character
if (/[^\x00-\xff]/g.test (s)) alert ("contains Chinese characters");
else alert ("All characters");
22.TEXTAREA the number of adaptive lines of text
<textarea Rows=1 name=s1 cols=27
Onpropertychange= "This.style.posheight=this.scrollheight" >
</textarea>
23. Date minus days equals second date
<script language=javascript>
function cc (DD,DADD)
{
You can add error handling
var a = new Date (DD)
A = A.valueof ()
A = A-dadd * 24 * 60 * 60 * 1000
A = new Date (a)
Alert (a.getfullyear () + "year" + (A.getmonth () + 1) + "month" +
A.getdate () + "Day")
}
CC ("12/23/2002", 2)
</script>
24. Which radio was chosen
function Checkme ()
For each OB in Radio1
If ob.checked then Window.alert ob.value
Next
End Function
</script><BODY>
<input name= "Radio1" type= "Radio" value= "style"
Checked>style
<input name= "Radio1" type= "Radio" value= "barcode" >barcode
<input type= "button" value= "Check" onclick= "Checkme ()" >
</BODY></HTML>
25. Get the Request.ServerVariables ("") collection of the URL on this page
Response.Write "<table border=1><!--TABLE Header
--><tr><td><b>variables</b></td><td><b>value</b></td> </TR> "
For each OB in Request.ServerVariables
Response.Write
"<TR><TD>" &ob& "</TD><TD>" &request.servervariables (OB) & "</TD>"
</TR> "
Next
Response.Write "</TABLE>"
26.
Native Ip<%=request.servervariables ("REMOTE_ADDR")%>
Server name <%=request.servervariables ("SERVER_NAME")%>
Server Ip<%=request.servervariables ("local_addr")%>
Server Port <%=request.servervariables ("Server_port")%>
Server Time <%=now%>
IIS version <%=request.servervariables "Server_software")%>
Script Timeout Time <%=Server.ScriptTimeout%>
This file path
<%=server.mappath (Request.ServerVariables ("Script_name"))%>
Number of server CPUs
<%=request.servervariables ("Number_of_processors")%>
Server Interpretation engine <%=scriptengine & "/" &
ScriptEngineMajorVersion & "." &ScriptEngineMinorVersion& "." &
ScriptEngineBuildVersion%>
Server operating system <%=request.servervariables ("OS")%>
The 27.ENTER key allows the cursor to move to the next input box
<input onkeydown= "if (event.keycode==13) event.keycode=9" >
28. Detect the link speed of a website:
Add the following code to the <body> area:
<script language=javascript>
Tim=1
SetInterval ("tim++", 100)
B=1
var autourl=new Array ()
autourl[1]= "Www.njcatv.net"
autourl[2]= "Javacool.3322.net"
autourl[3]= "www.sina.com.cn"
autourl[4]= "www.nuaa.edu.cn"
autourl[5]= "Www.cctv.com"
function Butt () {
document.write ("<form name=autof>")
for (Var i=1;i<autourl.length;i++)
document.write ("<input type=text name=txt" +i+ "size=10"
......> = "<input type=text name=url" +i+ "value= test
= "<input Type=button value=go
Onclick=w
