const 与 let 变量 模板字面量(``) 解构 const point = [10, 25, -34]; const [x, y, z] = point; console.log(x, y, z); 对象字面量简写法 let type = 'quartz'; let color = 'rose'; let carat = 21.29; const gemstone = {type,color,carat}; console.log(gemstone); for...of循环&Iterator let arr = ['a', 'b', 'c']; let iter = arr[S...