метод append

@DomName('FormData.append')
@DocsEditable()

void append(String name, String value)

Исходный код

@DomName('FormData.append')
@DocsEditable()
void append(String name, String value) =>
    _blink.BlinkFormData.instance.append_Callback_2_(this, name, value);

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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-html/FormData/append.html