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Update symbol.md

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demo不能在游览器上直接运行，故修改下；
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taxilng 2018-05-24 10:30:28 +08:00 committed by GitHub
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docs/symbol.md
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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。
```javascript
const log = {};
log.levels = {
DEBUG: Symbol('debug'),
INFO: Symbol('info'),
WARN: Symbol('warn')
};
log(log.levels.DEBUG, 'debug message');
log(log.levels.INFO, 'info message');
console.log(log.levels.DEBUG, 'debug message');
console.log(log.levels.INFO, 'info message');
```
下面是另外一个例子。