<HTML>
<Head>
<Title> </title>
</Head>
<Body>
<Div id = 'jsdiv 'style = "border: 1px solid # CCC"> </div>
<SCRIPT type = "text/JavaScript">
// Obtain the real length of the string (two bytes are converted into two single bytes)
Function getstractuallen (schars)
{
Return schars. Replace (/[^/x00-/xFF]/g, "XX"). length;
}
// Truncate a fixed-length substring. ssource is the string. ilen is the length.
Function getinterceptedstr (ssource, ilen)
{
If (ssource. Replace (/[^/x00-/xFF]/g, "XX"). Length <= ilen)
{
Return ssource;
}
VaR STR = "";
VaR L = 0;
VaR schar;
For (VAR I = 0; schar = ssource. charat (I); I ++)
{
STR + = schar;
L + = (schar. Match (/[^/x00-/xFF]/)! = NULL? 2: 1 );
If (L> = ilen)
{
Break;
}
}
Return STR;
}
VaR str1 = "this is a string truncation function, this is a test! 2 ";
Alert (getstractuallen (str1 ));
Alert (getinterceptedstr (str1, 25 ));
</SCRIPT>
</Body>
</Html>
