gistfile1.txt

var Promise = require('bluebird');
function request() {
  return new Promise(function (resovle, reject) {
    setTimeout(function() {
      var num = Math.random();
      if(num > 0.8){
        resovle(num);
      }else{
        reject(num);
      }
    },1000);
  })
}
function digui() {
  return request().then(function(res) {
    console.log('成功 ' + res);
    return;
  }).catch(function(err) {
    console.log('失败 ' + err);
    return digui();
  })
}
digui().done();