(function(){console.log(fn);????function?fn(){????????return?1;????}})();? ?我測試了如上代碼輸出函數(shù)體，add成功被預解析了；console.log(fn);for?(var?i=0;i<0;i++){????function?fn(){????????return?1;????}}? ?測試這段代碼發(fā)現(xiàn)輸出undefined，全局變量被預解析之后賦值為undefined，難道fn函數(shù)被當做var全局變量解析了嗎？