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@ -115,7 +115,7 @@ const sym = Symbol('foo');
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const sym = Symbol('foo');
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String(sym) // "Symbol(foo)"
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sym.toString // "Symbol(foo)"
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sym.toString() // "Symbol(foo)"
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```
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上面的用法不是很方便。[ES2019](https://github.com/tc39/proposal-Symbol-description) 提供了一个实例属性`description`,直接返回 Symbol 的描述。
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