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StringUtils 字符串工具扩展：强大的文本处理工具集 · App Inventor 2 中文网
... 无后缀
返回新字符串，不修改 Text 属性
Left(3)
“This” 后缀
修改内部 Text 属性
LeftThis(3)
“Of” 后缀
对传入的参数进行操作
LeftOf("Hello", 3)
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