接口请求失败重试机制

[54leibo]

function _ajax() {
    return new Promise((resolve, reject) => {
    ...
    })
 }
/**
 * HTTP Error retry
 * 
 * @params {Object} options: ajax params
 * @params {Number | undefined} limitCount: retry max count
 * @params {Number | undefined} providedCount: current retry count
*/
  function _retry(options, limitCount, providedCount) {
    // set default value
    if(!limitCount) {
      limitCount = 3
    }
    if(!providedCount) {
      providedCount = 0
    }
    return _ajax(options)
      .catch(err => {
      // retry condition
        if(err.name === 'HTTPError' && providedCount < limitCount) {
          return new Promise(resolve => {
          // retry after 1 second
            setTimeout(() => {
              resolve(_retry(options, limitCount, providedCount++))
            }, 1000)
          })
        }
        throw err
      })
  }