摘要：
ES5（JS）中定义匿名函数： const myFunc = function() { const myVar = "value"; return myVar; } ES6中定义匿名函数： const myFunc = () => { const myVar = "value"; return my 阅读全文
摘要：
const Some developers prefer to assign all their variables using const by default, unless they know they will need to reassign the value. Only in that 阅读全文
摘要：
When you declare a variable with the var keyword, it is declared globally, or locally if declared inside a function. 当使用var关键字声明变量时，它是全局声明的（在循环语句中声明也是 阅读全文