在阅读别人写的代码的时候，看到多处使用了这样一段代码，不知道是什么意思，有什么作用。向js高手请教。
var _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function(e) {
return typeof e
} : function(e) {
return e && "function" == typeof Symbol && e.constructor === Symbol ? "symbol" : typeof e
};
Symbol类型数据用于生产唯一性数据，解决代码冲突
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