云在青

摘要： 1.数组解构赋值 模式匹配 let [a,b,c] =[1,2,3] // a = 1 b = 2 c = 3 如无匹配值（解构不成功）则变量的值为 undefined 解构可设置默认值 let [a = 1, b = 2] = [ 2 ] // a = 2, b = 2 let [a = 1 , 阅读全文