helloSWZ

摘要： ###判断括号是否有效 var isValid = function(s) { let map = new Map(); let map1 = new Map(); map.set("(",")"); map.set("[","]"); map.set("{","}"); map1.set(")", 阅读全文

摘要： ##filter()去重 [1,2,3,4,3,2,1].filter((item,index,arr)=>arr.indexOf(item) index) ##new Set()去重 let arr = [...new Set([1,2,3,4,3,2,1])] ##reduce()去重 let 阅读全文