dart .. operator & dart .. syntax

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dart .. operator & dart .. syntax

Cascade notation (..)

// Cascade notation (..)
querySelector('#confirm') // Get an object.
  ..text = 'Confirm' // Use its members.
  ..classes.add('important')
  ..onClick.listen((e) => window.alert('Confirmed!'));

https://dart.dev/guides/language/language-tour#cascade-notation-

https://www.cnblogs.com/xgqfrms/p/11305877.html

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级联符号