在vue或是react中进行网络请求axios用的都比较多,有时会因为网络不稳定问题导致请求超时,请求超时后常用解决方案都会重新尝试发送请求,尝试指定次数后不管成功与否皆结束本次请求

下面是具体解决方案,主要使用了axios提供的拦截器

//在main.js设置全局的请求次数，请求的间隙
axios.defaults.retry = 4;
axios.defaults.retryDelay = 1000;

axios.interceptors.response.use(undefined, function axiosRetryInterceptor(err) {
    var config = err.config;
    // If config does not exist or the retry option is not set, reject
    if(!config || !config.retry) return Promise.reject(err);

    // Set the variable for keeping track of the retry count
    config.__retryCount = config.__retryCount || 0;

    // Check if we've maxed out the total number of retries
    if(config.__retryCount >= config.retry) {
        // Reject with the error
        return Promise.reject(err);
    }

    // Increase the retry count
    config.__retryCount += 1;

    // Create new promise to handle exponential backoff
    var backoff = new Promise(function(resolve) {
        setTimeout(function() {
            resolve();
        }, config.retryDelay || 1);
    });

    // Return the promise in which recalls axios to retry the request
    return backoff.then(function() {
        return axios(config);
    });
});