2401_84436058的博客(function () { if (typeof name === undefined ) { var name = Jack ; console.log( Goodbye + name); } else { console.log( Hello + name); }})(); // A. Goodbye Jack// B. Hello Jack// C. Hello undefined// D...
qq_40567849的博客在这里记录下来比较适合我思维的实现方式 ...obj[‘a’]与obj.a等价 详细参考链接:[添加链接描述] (https://www.cnblogs.com/leiyangs/p/7490665.html) let testStr = 'asdasddsfdsfadsfdghdadsdfdgdasd'; function