1. Helm内置函数

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1.1 upper

将整个字符串转换为大写:

upper "hello"

upper "hello"

1.2 lower

将整个字符串转换为小写:

lower "HELLO"

lower "HELLO"

1.3 title

转换为标题大小写:

title "hello world"

title "hello world"

returns Hello World