[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8},"actionData","errors","root",{"_11":-5},"routes/user.$name.replies",{"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":16},"replies",[34],"user",{"_20":21,"_13":14,"_22":23,"_24":14,"_25":26,"_27":28,"_29":30,"_31":16,"_32":33},"loginname","SlashChu","page",1,"limit",50,"total","id","27404","avatar_url","https://avatars1.githubusercontent.com/u/18146431?v=3","githubUsername","create_at","2017-03-13 01:41:36.917","score",5,"topic_count",0,"reply_count","is_star",false,{"_20":35,"_36":37,"_38":39,"_40":41,"_42":43,"_44":45,"_46":33,"_47":33,"_31":48,"_49":50,"_25":51,"_52":53},"17291","author_id","20745","tab","share","content","阿里云[OSS SDK for JavaScript][ali-oss]刚推出时，为了解救[Callback Hell][callback-hell]，我们积极[拥抱ES6][hug-es6]。经过一段时间的使用，收到了很多好评（虽然大部分是给ES的），同时也收到了不少抱怨，`co`和`yield`对于很多用户来说还是有不低的使用门槛。现在，对callback情有独钟的朋友们，也可以愉快地使用OSS js sdk了：\r\n\r\n安装\r\n```bash\r\n# >= 4.3.0\r\nnpm install ali-oss\r\n```\r\n\r\n使用：\r\n```js\r\nvar OSS = require('ali-oss').Wrapper;\r\n\r\nvar client = new OSS({\r\n region: 'oss-cn-hangzhou',\r\n accessKeyId: '',\r\n accessKeySecret: '',\r\n bucket: ''\r\n});\r\n\r\nclient.list().then(function (result) {\r\n console.log(result.objects);\r\n}).catch(function (err) {\r\n console.error(err);\r\n});\r\n```\r\n\r\n使用`Wrapper`构造出来的`OSS`对象拥有原来的所有接口，只是把原来的generator function换成了普通的函数，并且返回一个[Promise][promise]，通过`.then()`处理异步结果，通过`.catch()`处理错误。当然原来的使用方式依然支持。\r\n\r\nPromise的使用与Callback接近，但是却可以更加灵活。例如对于多层嵌套的callback，可以使用[Promise chaining][promise-chaining]的方式让代码更直观：\r\n\r\n```js\r\n// 上传一个文件，成功后下载这个文件\r\nclient.put('object', '/tmp/file').then(function (val) {\r\n console.log(val.res);\r\n return client.get('object');\r\n}).then(function (val) {\r\n console.log(val.res);\r\n console.log(val.content.toString());\r\n});\r\n```\r\n浏览器使用也更方便了：\r\n\r\n```html\r\n\r\n\r\n```\r\n一个完整的例子可以参考：https://github.com/rockuw/oss-in-browser\r\n\r\n除此之外，SDK还有众多的优化，欢迎试用：\r\n\r\n- 简化浏览器版本体积，从1.1MB下降到360KB。[#94][pr-dist-size]\r\n- 支持断点续传。[#80][pr-resumable]\r\n- 更多bug fix及优化见：[changelog][changelog]\r\n\r\n项目地址（欢迎fork/star/pr）：https://github.com/ali-sdk/ali-oss\r\n\r\n[callback-hell]: http://callbackhell.com/\r\n[hug-es6]: https://cnodejs.org/topic/56ab1c0526d02fc6626bb383\r\n[promise]: https://www.promisejs.org/\r\n[promise-chaining]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise\r\n[ali-oss]: https://github.com/ali-sdk/ali-oss\r\n[pr-dist-size]: https://github.com/ali-sdk/ali-oss/pull/94\r\n[pr-resumable]: https://github.com/ali-sdk/ali-oss/pull/80\r\n[changelog]: https://github.com/ali-sdk/ali-oss/blob/master/History.md","title","倾听用户：OSS JavaScript SDK支持callback方式","last_reply_at","2018-05-11 11:55:40.633","good","top",29,"visit_count",32207,"2016-04-14 12:13:21.658","author",{"_13":54,"_22":55},"rockuw","https://avatars2.githubusercontent.com/u/1209779?v=4"]