需求情况比较简单： 需要在前端实现一个重试的功能，如果一个请求访问出错（不管是后端服务出错还是网络出错，亦或者是请求的结果不符合预期）均可进行自动重试
直接上代码
<!DOCTYPE html>
<html>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script>
//最大重试次数
const MAX_RETRY = 3
//请求超时时间
const REQUEST_TIMEOUT = 15 * 1000
// 重试间隔500ms
const RETRY_INTERVAL = 500
function sleep(ms){
return new Promise((resolve)=>setTimeout(resolve,ms));
}
async function request(url,method,params,retry = MAX_RETRY,hookResult = null){
let res
let requireRetry
try {
//构造请求的参数
let config = {
url: url,
method: method,
timeout: REQUEST_TIMEOUT
}
if(Object.is(method,'get')){
config['params'] = params
}else if (Object.is(method,"post")){
config['data'] = params
}
res = await axios.request(config)
//发生服务器错误，重试
if (res && res.status > 500){
console.log('返回的状态码:', res.status)
requiretRetry = true
}
//使用调用者逻辑判断，如果未达到期许，重试
if (hookResult && !hookResult(res)){
console.log('hookResult函数返回为false，需要重试')
requiretRetry = true
}
}catch(err){
console.log(err)
// 发生网络错误，重试
requireRetry = true
}
if (requireRetry && retry > 0){
// 500ms之后重试
await sleep(RETRY_INTERVAL)
console.log('重试', retry)
res = await request(url, method, params, --retry, hookResult)
}
return res
}
//use example
async function test()
{
let res =await request("https://www.baidu.com/s","get",{"wd":"hello"})
console.log("result is : " , res)
}
</script>
<body >
<button type="button" onclick="test()">Click Me!</button>
</body>
</html>
