初始化

康凯

2022-05-20 aa4c235a8ca67ea8b731f90c951a465e92c0a865

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var global = require('../internals/global');
var shared = require('../internals/shared');
var has = require('../internals/has');
var uid = require('../internals/uid');
var NATIVE_SYMBOL = require('../internals/native-symbol');
var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');
 
var WellKnownSymbolsStore = shared('wks');
var Symbol = global.Symbol;
var createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol : Symbol && Symbol.withoutSetter || uid;
 
module.exports = function (name) {
  if (!has(WellKnownSymbolsStore, name)) {
    if (NATIVE_SYMBOL && has(Symbol, name)) WellKnownSymbolsStore[name] = Symbol[name];
    else WellKnownSymbolsStore[name] = createWellKnownSymbol('Symbol.' + name);
  } return WellKnownSymbolsStore[name];
};