Promise 用法
let request = new Promise((resolve, reject) => { // 表达式 if (true) { resolve({ age: 20 }); } else { reject('申请接口失败'); }});request .then(res => { console.log('res', res); // { age: 20 } }) .catch(res => { console.log('res2', res); // 申请接口失败 });
Promise.all 用法
let requestA = new Promise(resolve => { setTimeout(() => { resolve({ requestA: 20 }); }, 1000 * 2);});let requestB = new Promise(resolve => { resolve({ requestB: 50 });});let requestAll = Promise.all([requestA, requestB]).then(res => { console.log('res', res); // [{ requestA: 20 }, { requestB: 50 }]});
文章的内容/灵感都从下方内容中借鉴
- 【继续保护/更新 500+前端面试题/笔记】https://github.com/noxussj/In...
- 【大数据可视化图表插件】https://www.npmjs.com/package...
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