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remove unnecessary usage of Symbol.for
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docs/symbol.md

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Original file line numberDiff line numberDiff line change
@@ -246,7 +246,7 @@ Symbol作为属性名,该属性不会出现在`for...in`、`for...of`循环中
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```javascript
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var obj = {};
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var a = Symbol('a');
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var b = Symbol.for('b');
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var b = Symbol('b');
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obj[a] = 'Hello';
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obj[b] = 'World';

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