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try-do

v1.0.0

Published

尝试执行一个任务,直到执行成功,除非超过指定次数或时间

Downloads

1

Readme

try-do

尝试执行一个任务,直到执行成功,除非超过指定次数或时间

安装

npm install try-do --save

使用

var tryDo = require('try-do');

var count = 0;

tryDo(function () {
  return Promise[++count === 2 ? 'resolve' : 'reject'](count);
}, {count: 3}).then(function (data) {
  assert(data, 2);
});

接口定义

/**
 * 尝试执行一个任务,直到执行成功,除非超过指定次数或时间
 *
 * 任务支持同步和异步,异步支持 Promise 和 Callback 两种风格
 * 同步函数是否执行成功,是按返回值是否为 undefined 判断依据,undefined 代表执行失败,否则成功。
 *
 * @param {function} task 需要执行的任务
 * @param {Object} options 参数
 * @param {number} [options.count=1] 次数限制
 * @param {number} [options.timeout] 时间限制
 * @param {number|function} [options.delay=0] 任务之间的延时,可以是函数
 * @param {function} [options.callback] 结束后的回调
 * @return {Object} 任务执行的 Promise 对象
 */
function tryDo(task, options)