[js] 写一个方法实现promise失败后自动重试
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<script>Promise.retry = (fun, limit = 5) => {return new Promise((resolve, reject) => {let __num = 1;let __run = () => {fun().then(res => {resolve(res);}).catch(err => {if (__num++ >= limit) {reject(err)} else {console.log('retry again!!')__run()}})}__run()})}let k = 0function test() {return new Promise((resolve, reject) => {if (++k >= 3) {resolve(k)} else {reject('hhh')}})}Promise.retry(test).then(res => {console.log('resolve: ', res)}).catch(err => {console.log('reject: ', err)})// retry again!!// retry again!!// resolve: 3
</script>
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