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127 Promiseexecutor 函数 let self self. self. self. self. self. resolvevalue self. self. self. value self.. fn fn rejectreason self. self. self. reason self.. fn fn executorresolve reject e rejecte resolvePromisepromise2 x resolve reject promise2 x reject TypeError let called x x x let then x. then then.x y called called resolvePromisepromise2 y reject err called called rejecterr resolvex e called called rejecte resolvex Promise.. onFulfilled onRjected onFulfilled onFulfilled onFulfilled value