let arr = ['132','qwedd','q','2r','qwd'];
arr.sort(function(a,b){return a.length-b.length;
})
//输出 ["q", "2r", "132", "qwd", "qwedd"]//倒叙
let arr = ['132','qwedd','q','2r','qwd'];
arr.sort(function(a,b){return b.length-a.length;
})