The method takes a string parameter, enclosed in quotes, and a code block.
该方法具有一个使用引号括起来的字符串参数和一个代码块。
Static values don't have to be enclosed in quotes, but it is recommended for literal strings.
静态数值不需要加引号,但是字符串例外。
Any leading or trailing Spaces around integer, Boolean, or enumerated values are ignored, even if enclosed in quotes.
即使将整数、布尔值或枚举值用引号括起来,其周围的任何前导或尾随空格也将被忽略。
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