- tit:positionof 
- type:$type_both 
- alias:position, positions 
- syntax:!positionof [`type'] `s' in `string' 
- mean:·µ»Ø¶ÔÏó `s' ÔÚ `string' ÀïµÄλÖÃ. <br>\ 
-   `type' ¿ÉÒÔÊÇ <tt>char</tt>, <tt>word</tt>, <tt>item</tt> »ò\ 
-   <tt>line</tt>. Èç¹û±»Ö¸¶¨, ¾ÍÔÚ `string' ÀïѰÕÒÓë `s' ÍêÈ«ÏàͬµÄ¶ÔÏó. <br>\ 
-   ÃüÁîµÄÊä³öÊÇ `s' ³öÏÖÔÚ `string' ÀïµÄλÖñí\ 
-   (×÷Ϊ×Ö·û, ´Ê, Ïî»òÐÐ, ÓÉ `type' È·¶¨). <br>\ 
-   Èç¹ûûÓÐÖ¸¶¨ `type', Ôò `s' ¿´×÷\ 
-   `string' µÄ×Ö´®, ±¨¸æµÄλÖÃÊÇ×Ö·ûµÄλÖÃ. 
-