jeffwang

```javascript const arr1 = ["A1", "A2", "B1", "B2", "C1", "C2", "D1", "D2"]; const arr2 = ["A", "B", "C", "D"]; const result = [...arr1, ...arr2].sort((a, b) => { const [letterA, noA...

```javascript const intersection = (arr1, arr2) => { const _arr2 = [...arr2]; return arr1.filter(v1 => { const index = _arr2.findIndex(v2 => v2 === v1); return index >= 0 ? (_arr2.splice(index,...

```javascript function print(n){ setTimeout(console.log(n),() => { console.log(n); }, Math.floor(Math.random() * 1000)); } for(var i = 0; i < 100; i++){ print(i); } ````

附议，希望增加最后操作人员的系统字段。

```javascript //1. Promise const sleep1 = time => new Promise(resolve => setTimeout(resolve, time)); //2.without Promise const sleep2 = time => ({ then: cb => { setTimeout(cb, time); } }); //3....