If you use tabs to indent your article or tutorial, the column number shown in your editor may not match the column number reported in an error message.
如果您在文章或教程中使用制表符缩进，那么编辑器中显示的行号可能与报告错误的行号不匹配。
2
Removes the indent characters from the selected lines by the given number of indentation levels.
按给定的缩进级别数从选定行移除缩进字符。
3
Using this method to set the indent level to a number less than 0 (zero) or greater than 15 causes an exception to be thrown.