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Merge branch 'gh-pages' of github.com:ruanyf/es6tutorial into gh-pages

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docs/symbol.md
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@ -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
```javascript
var obj = {};
var a = Symbol('a');
var b = Symbol.for('b');
var b = Symbol('b');
obj[a] = 'Hello';
obj[b] = 'World';