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写出优雅的js代码
source link: https://juejin.im/post/5bf6629fe51d454f677c2f6d
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一.常量相关 1.定义常量 var a=1; // 错误："var"定义的"常量"是可变的，在声明一个常量时，该常量在整个程序中都应该是不可变的。 正解： const a=1 2.给常量赋值 let lastName = fullName[1]; // 错误：
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