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延时函数实现

setInterval实现setTImeout

js

function mySetTimeout(fn, delay){
    let timer = null;
    return (timer = setInterval(()=>{
        fn();
        clearInterval(timer)
    },delay));
}

setTImeout实现setInterval

js

function mySetInterval(fn, delay){
    let timer = null;
    const interval = function(){
        timer = setTimeout(()=>{
          fn();
          interval();
        }, delay);
    }
    interval();
    return {
        cancel:function(){
            clearTimeout(timer);
        }
    }
}