遇到什么补充什么：

字符串换行: \n
字符串空格：\t

\b Backspace字符(ASCII 8)
\f 走纸换页字符(ASCII 12)
\n 换行字符(ASCII 10)
\r 回车自负(ASCII 13)
\t 制表符(Tab)(ASCII 9)
\” 双引号
\’; 单引号
\\ 反斜线符号(\)
\000~\377 一个用8进制指定的字符(占一个字节)
\x00~\xFF 一个用16进制指定的字符(占一个字节)
\u0000~\uFFFF 一个用16进制指定的Unicode字符(占两个字符)


输出：

13
0
she is a girl
is
i
i
rl
rl
She is a girl
0
She,is
object
true
false
false

AS3 code：

package 
{
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    public class Main extends Sprite
    {
        var str:String = "She is a girl";
        public function Main():void
        {
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.align = StageAlign.TOP_LEFT;
            Init();
        }
        private function Init()
        {
            var len:int = str.length;
            trace(len);
            var num1:int = str.indexOf("She");
            trace(num1);
            trace("she".concat(str.slice((num1+3))));
            trace(str.substr(4,2));
            trace(str.substring(4,5));
            trace(str.slice(4,5));
            trace(str.substr(-2));
            trace(str.slice(-2));
            trace(str.substring(-2));
            trace(str.search("She"));
            trace(str.split(" ",2));
            trace(typeof(str.split(" ",100)));
            trace(typeof(str.split(" ",100)) is Object);
            trace(typeof(str.split(" ",100)) is Array);
            trace((typeof(str.split(" ",100)) as Array) is Array);
        }
    }
}