js利用递归和promis实现数据重试

作者: 2017会飞的鱼 | 来源:发表于2022-08-30 12:00 被阅读0次

下例实现重试10次请求：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Promis example</title>
    <script>
        function startapi(reqId, resolve, reject){
            let timers=0;
            return function apirequest(){
                let arg = arguments[0];
                let a = new Promise((res,rej)=>{
                    setTimeout(()=>{
                        res('成功返回数据')
                    }, 100)
                });
                a.then(()=>{
                    timers++;
                    if(timers>10){
                        return resolve('over');
                    }
                    console.log('timers:',timers, ' id:', reqId);
//                    if(timers==3){
//                        return reject('第三个失败')
//                    }
                    apirequest(timers)
                }).catch(err=>{
                    apirequest(timers)
                    console.log(err)
                })
            }
        }
        function handle(){
            return new Promise((res,rej)=>{
                let newreq = startapi('1122', res, rej);
                newreq(0);
            })
        }
        
        handle().then(res=>{
            console.log('handle:', res);
        }).catch(err=>{
            console.log('handle err:', err);
        });
        
    </script>
</head>
<body>
    
</body>
</html>