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Merge pull request #686 from taxilng/patch-2

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Update symbol.md
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Ruan YiFeng 2018-05-28 13:50:37 +08:00 committed by GitHub
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@ -163,13 +163,15 @@ let obj = {
Symbol 类型还可以用于定义一组常量，保证这组常量的值都是不相等的。 Symbol 类型还可以用于定义一组常量，保证这组常量的值都是不相等的。
```javascript ```javascript
const log = {};
log.levels = { log.levels = {
DEBUG: Symbol('debug'), DEBUG: Symbol('debug'),
INFO: Symbol('info'), INFO: Symbol('info'),
WARN: Symbol('warn') WARN: Symbol('warn')
}; };
log(log.levels.DEBUG, 'debug message'); console.log(log.levels.DEBUG, 'debug message');
log(log.levels.INFO, 'info message'); console.log(log.levels.INFO, 'info message');
``` ```
下面是另外一个例子。 下面是另外一个例子。