截取字符串中的子串 substring
左截取字符串 Left
截取字符串两头的空格 Trim
获取字符串的长度 Len
取字符串的子串 SUBSTR
从文件指针中读取字符 fgetc
截取字符串 substr ; String Subset
取字符串数据指令 Load String Instruction
从流中读取字符 getc
主要的事件有进入和离开一个元素，取字符数据。
The main ones are entering and leaving an element, and getting character data.
从任意字体中选取字符并复制到剪贴板中。
Select special characters from any fonts and put them into the clipboard.
注意：要从字符的尾部开始取字符，用负数做为起始字符。
Note: To extract characters from the end of the string, use a negative start number.
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