ES6 learning(入门)第一记
let命令用let命令限定作用域变量 i 的作用域//ES5
if (true) {
var i = 1;
}
console.log(i);//ES6
if (true) {
let i = 1;
}
console.log(i)重复定义var i = 0;
switch (i) {
case 0:
let value = "hello";
case 1:
let value = "world"...
