Returns the value associated with property
from the proxied JavaScript object.
The type of property
must be either String or num.
dynamic operator [](property) { if (property is! String && property is! num) { throw new ArgumentError("property is not a String or num"); } return _convertToDart(JS('', '#[#]', _jsObject, property)); }
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https://api.dartlang.org/stable/2.0.0/dart-js/JsObject/operator_get.html