练习题4：间隔特定的时间执行函数

有若干和函数（fn1,fn2,....fnn），需要编写一个函数，进行间隔特定的时间执行特定的函数

比如 隔间 1 秒执行 fn1 ，之后间隔 2 秒执行 fn2

比如 隔间立即执行 fn1，之后间隔 4 秒执行 fn3

function sleep (time) {
  return new Promise((resolve) => setTimeout(resolve, time));
}
async function fn(arr){
    for(let item of arr){
        await sleep(item.time).then(()=>{item.fn()})
    }

}
fn([
    {
        time:1000,
        fn(){
            console.log('1秒后执行fn1')
        }
    },
    {
        time:2000,
        fn(){
            console.log('2秒后执行fn2')
        }
    }
])

fn([
    {
        time:0,
        fn(){
            console.log('立即执行fn1')
        }
    },
    {
        time:4000,
        fn(){
            console.log('4秒后执行fn2')
        }
    }
])

Start by locating the exercise 4 entry or related example in the repository, since no file or test is named. Implement the function described in the issue so each supplied callback runs after its specified delay, then verify both the one-second/two-second and immediate/four-second examples.