前端 Promise 问题?-灵析社区
练习代码二十年请大佬帮忙分析一下，以下代码执行顺序(正确的顺序是：a 1 2 3 b 4 c 5)： Promise.resolve() .then(() => { console.log('a'); return new Promise(res => res()); }) .then(() => { console.log('b'); }) .then(() => { console.log('c'); }); Promise.resolve() .then(() => { console.log(1); }) .then(() => { console.log(2); }) .then(() => { console.log(3); }) .then(() => { console.log(4); }) .then(() => { console.log(5); });
喝一杯吧可以吗参考
"https://segmentfault.com/q/1010000039387146" (https://segmentfault.com/q/1010000039387146)
"https://www.zhihu.com/question/453677175" (https://link.segmentfault.com/?enc=%2Feok54EXUYDf2ZmMmDge6A%3D%3D.t%2FDkDJrpw%2Bg7JTzBcKKXEMergJwuOlUZcMESxQNQ3tPEOh93Enc6fpfJGCdQ%2BvhL)
记住"return Promise.resolve()"、 "return new Promise(resolve => { reolve() })" 与
"return new Promise(resolve => { reolve() }).then(res => {return res})"这三个返回值会卡两次