Prototype is an API written in Javascript, including the expansion of JavaScript classes such as string and array. You can embed Javascript files and use them directly.
CopyCode The Code is as follows: String. Prototype. strlen = function (){
VaR Len = 0;
For (VAR I = 0; I <this. length; I ++ ){
If (this. charcodeat (I)> 255 | this. charcodeat (I) <0) Len + = 2; else Len ++;
}
Return Len;
}
// Split the string into characters and coexist in the array
String. Prototype. strtochars = function (){
VaR chars = new array ();
For (VAR I = 0; I <this. length; I ++ ){
Chars [I] = [This. substr (I, 1), this. ischs (I)];
}
String. Prototype. charsarray = chars;
Return chars;
}
// Determine whether a character is a Chinese character
String. Prototype. ischs = function (I ){
If (this. charcodeat (I)> 255 || this. charcodeat (I) <0)
Return true;
Else
Return false;
}
// Truncate the string (from the start byte to the end byte)
String. Prototype. subchstring = function (START, end ){
VaR Len = 0;
VaR STR = "";
This. strtochars ();
For (VAR I = 0; I <this. length; I ++ ){
If (this. charsarray [I] [1])
Len + = 2;
Else
Len ++;
If (end <Len)
Return STR;
Else if (start <Len)
STR + = This. charsarray [I] [0];
}
Return STR;
}
// Truncate the string (The Length byte is truncated from the start byte)
String. Prototype. subchstr = function (START, length ){
Return this. subchstring (start, start + length );
}
VaR li = Document. getelementsbyname ("listtitle ");
For (VAR I = 0; I <li. length; I ++)
{
Li [I]. innerhtml = Li [I]. innerhtml. subchstr (0, 28) + "...";
}
Prototype is used to inherit prototype objects, mainly to save memory space.
