? (JavaScript)

? (JavaScript)

[1] ECMAScript® 2017 Language Specification ( ()) <https://tc39.github.io/ecma262/#sec-algorithm-conventions>

[2] Add the ability to construct a callback function (domenic著, ) <https://github.com/heycam/webidl/commit/36b3646ac02654626b575ac9891b6e9d75adbfe7>