Symbol.prototype[@@toPrimitive]

[@@toPrimitive]() 方法可将 Symbol 对象转换为原始值。

语法

Symbol()[Symbol.toPrimitive](hint);

该原始值为指定的 Symbol 对象

Symbol 的 [@@toPrimitive]() 方法返回该 Symbol 对象原始值作为 Symbol 数据形式。 hint 参数未被使用。

JavaScript 调用 [@@toPrimitive]() 方法将一个对象转换为原始值表示。你不需要自己调用 [@@toPrimitive]() 方法；当对象需要被转换为原始值时，JavaScript 会自动地调用该方法。

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) Symbol.prototype.@@toPrimitive	Standard	Initial definition.
ECMAScript (ECMA-262) Symbol.prototype.@@toPrimitive	Living Standard

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`@@toPrimitive`	Chrome Full support 47	Edge Full support 15	Firefox Full support 44	IE No support No	Opera Full support 34	Safari Full support 10	WebView Android Full support 47	Chrome Android Full support 47	Firefox Android Full support 44	Opera Android Full support 34	Safari iOS Full support 10	Samsung Internet Android Full support 5.0	nodejs Full support 6.0.0