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Copy codeThe Code is as follows:
<Script language = "JavaScript">
// Obtain the total number of characters
Function getChars (str ){
Var I = 0;
Var c = 0.0;
Var unicode = 0;
Var len = 0;
If (str = null | str = ""){
Return 0;
}
Len = str. length;
For (I = 0; I <len; I ++ ){
Unicode = str. charCodeAt (I );
If (unicode <127) {// determines whether it is a single character or a dual character
C + = 1;
} Else {// chinese
C + = 2;
}
}
Return c;
}
Function sb_strlen (str ){
Return getChars (str );
}
// Intercept characters
Function sb_substr (str, startp, endp ){
Var I = 0; c = 0; unicode = 0; rstr = '';
Var len = str. length;
Var sblen = sb_strlen (str );
If (startp <0 ){
Startp = sblen + startp;
}
If (endp <1 ){
Endp = sblen + endp; //-(str. charCodeAt (len-1) <127 )? 1: 2 );
}
// Start point
For (I = 0; I <len; I ++ ){
If (c> = startp ){
Break;
}
Var unicode = str. charCodeAt (I );
If (unicode <127 ){
C + = 1;
} Else {
C + = 2;
}
}
// Start to fetch
For (I = I; I <len; I ++ ){
Var unicode = str. charCodeAt (I );
If (unicode <127 ){
C + = 1;
} Else {
C + = 2;
}
Rstr + = str. charAt (I );
If (c> = endp ){
Break;
}
}
Return rstr;
}
// Call example:
Function getaskfilename (filename ){
Short_filename = filename;
If (sb_strlen (short_filename)> 61 ){
Short_filename = sb_substr (short_filename, 0, 36) + '...' + sb_substr (short_filename,-20 );
}
Return short_filename;
}
Var chara = 'ni, hello! '
Js_self = chara. substr (4 );
Test = sb_substr (chara, 4 );
Alert ("js_self:" + js_self + "ext:" + test );
</Script>
Copy codeThe Code is as follows:
Function mb_strlen (str ){
Var len = 0;
For (var I = 0; I <str. length; I ++ ){
Len ++ = str. charCodeAt (I) <0 | str. charCodeAt (I)> 255? (Charset = 'utf-8 '? 3: 2): 1;
}
Return len;
}
<Html> </pead> <body> </ptml>
[Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]
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