摘要：let arr = [1,2,1,2,3,6,3,3,6,4,4,5,5,1,1,6,9,8] let isArr1 = (arr)=>{ let leng = arr.length/2 let num = 0; let soarr = arr.sort() for(let i=0;i<soarr. 阅读全文