把接口调用成功的回调函数返回的参数 return 出去 用 Promise 来实现 public.js // 引入接口letrequest=require('@/common/request.js')module.exports={// 获取位置getLocation(){returnnewPromise((resolve,reject)=>{uni.getLocation({type:'wgs84',success(res){letlatitude=res.latitude;letlongitude=res.longi...
在Promise中,reject也是一个函数,它允许我们将异步操作失败时的错误信息返回给Promise对象。可以将reject看作是Promise中的失败回调函数。一般情况下,reject函数接收一个参数,该参数即为异步操作失败时的错误信息。 下面是一个使用Promise的示例: ``` const promise = new Promise((resolve, reject) => { setTimeout...
)和 new Promise((resolve, reject)=>...) 里的 resolve(其实质是规范中的 Promise Resolve Function,链接在文末。)。(then 创建新 Promise 实例,其中一个子步骤相当于调用 new Promise((resolve, reject)=>...)。) 别的不说了,照着代码,我们先来看初始任务。 (初始任务)第一部分 Promise.resolve() 返...
return new Promise((resolve, reject) => { if (!url) { return reject(new TypeError('the required parameter [url] is missing.')); } if (method.toLowerCase() === 'get' && body) { url += `?${request.serialize(body)}`; body = null; } const xhr = new XMLHttpRequest(); xhr....
new Promise(function (resolve, reject) { resolve(a); // 这里的a变量不存在 }); promise...
a;// promise <pending> 2. let a = new Promise((resolve,reject)=>{ Promise.reject(234) }) a;// promise <pending> 3. let a = new Promise((resolve,reject)=>{ return Promise.reject(12) } a;//promise <pending> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Globa...
new Promise((res,rej)=>{ res(); console.log(1); rej(); console.log(2) })直接输出: 1,2。并且此时是 resolve 状态。Promise {<resolved>: undefined}有用 回复 查看全部 4 个回答 推荐问题 省市区街道数据在哪里可以下载? 省市区街道数据在哪里可以下载? 6 回答5.3k 阅读✓ 已解决 js 如何将...
let a = new Promise((resolve,reject)=>{ Promise.reject(234) }) a;// promise <pending> 3. let a = new Promise((resolve,reject)=>{ return Promise.reject(12) } a;//promise <pending> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/reject...
Promise resolve and reject now return Interrupt errors … 85fc80e Contributor Author mstoykov commented Oct 23, 2024 I went with a bare minimum change and test. If you have some other cases which you will want to test I will gladly add them. mstoykov commented Oct 23, 2024 View rev...
你好，这代码并没有做到递归，且只有满足resolve判断条件的getBuilds函数Promise实例状态为fulfilled。其他...