Effect of common code running in forums implemented by pure js

Put runcode. js in the website directory when using it, and put the following code where you need to run the code
Copy codeThe Code is as follows:
<Div style = "margin-top: 1em; margin-bottom: 1em"> <div style = "display: none "> {1} </div> <textarea rows =" 12 "cols =" 95 "style = 'font-family:" Courier New ", Courier, monospace; '> </textarea> <script src = "runcode. js "> </script> <br/> <input type =" button "value =" run code "style =" border-left: 1px solid # B1B4CD; border-right: 1px solid #494D74; border-top: 1px solid # B1B4CD; border-bottom: 1px solid #494D74; background: #696D81; color: # FFFFFF; "onclick =" runCode (this) "> <input type =" button "style =" border-left: 1px solid # B1B4CD; border-right: 1px solid #494D74; border-top: 1px solid # B1B4CD; border-bottom: 1px solid #494D74; background: #696D81; color: # FFFFFF; "value =" Copy code "onclick =" copycode (this) "> <input type =" button "style =" border-left: 1px solid # B1B4CD; border-right: 1px solid #494D74; border-top: 1px solid # B1B4CD; border-bottom: 1px solid #494D74; background: #696D81; color: # FFFFFF; "value =" Save code "onclick =" saveCode (this) "> <input type =" button "style =" border-left: 1px solid # B1B4CD; border-right: 1px solid #494D74; border-top: 1px solid # B1B4CD; border-bottom: 1px solid #494D74; background: #696D81; color: # FFFFFF; "value =" Restore code "onclick =" preCode (this) "> tip: you can modify some code before running </div>

You can.
Runcode. js File
Copy codeThe Code is as follows:
// Scripts runcode for BBS ver 2008-06-30, by Bound0 (bound0@veryhman.com)
// First published at http://bbs.blueidea.com
// An example: http://bbs.veryhman.com/showtopic-20094.aspx

Function runCode (which ){
Var p = which. parentNode;
Var OS = p. getElementsByTagName ("textarea ");
If (OS. length = 0) return;
Var o = OS [0];
Var winname = window. open (''," _ blank ",'');
Winname.doc ument. open ('text/html ', 'replace ');
Winname. opener = null;
Winname.doc ument. write (o. value );
Winname.doc ument. close ();
}
Function saveCode (which ){
Var p = which. parentNode;
Var OS = p. getElementsByTagName ("textarea ");
If (OS. length = 0) return;
Var o = OS [0];
Var winname = window. open ('', '_ blank', 'top = 10000 ');
Winname.doc ument. open ('text/html ', 'replace ');
Winname.doc ument. write (o. value );
Winname.document.execcommand('saveas', '', 'code.htm ');
Winname. close ();
}
Function copycode (which ){
Var p = which. parentNode;
Var OS = p. getElementsByTagName ("textarea ");
If (OS. length = 0) return;
Var o = OS [0];
Var is_ie = (userAgent. indexOf ('msie ')! =-1 &&! Is_opera) & userAgent. substr (userAgent. indexOf ('msie ') + 5, 3 );
If (is_ie & o. style. display! = 'None '){
Var rng = document. body. createTextRange ();
Rng. moveToElementText (o );
Rng. scrollIntoView ();
Rng. select ();
Rng.exe cCommand ("Copy ");
Rng. collapse (false );
}
}
Function text (e)
{
Var t = "";
E = e. childNodes | e;
For (var j = 0; j <e. length; j ++)
{

If (e [j]. nodeType! = 1) {t + = e [j]. nodeValue}
Else
{
Var k = e [j]. nodeName;
If (k = 'br '| k = 'P') {t + =' \ r \ n '}
T + = text (e [j]. childNodes)
}
}
Return t;
}
Function preCode (which ){
Var p = which. parentNode;
Var OS = p. getElementsByTagName ("textarea ");
If (OS. length = 0) return;
Var o = OS [0];
Var osv = p. getElementsByTagName ("div ");
If (osv. length = 0) return;
Var ov = osv [0];
Var c =''
If (typeof (ov. innerText )! = "Undefined") {c = ov. innerText} else {c = text (ov )}
O. value = c
}
(Function () {var s = document. getElementsByTagName ("script"); preCode (s [s. length-1])}) ()