象形

确定JS环境是否支持Symbol。支持spec或sham。

例子

var hasSymbols = require('has-symbols');

hasSymbols() === true; // if the environment has native Symbol support. Not polyfillable, not forgeable.

var hasSymbolsKinda = require('has-symbols/shams');
hasSymbolsKinda() === true; // if the environment has a Symbol sham that mostly follows the spec.

支持的符号类型

• get-own-property-symbols npm | github
• core-js npm | github

测试

简单地克隆回购， npm install，然后跑 npm test