promise的使用

function func1() { return new Promise((resolve) => { setTimeout(() => { resolve("func1 1000"); }, 1000); }); }; function func2() { return new Promise((resolve) => { setTimeout(() => { resolve("func1 2000"); }, 2000); }); }; function func3() { return new Promise((resolve) => { setTimeout(() => { resolve("func1 3000"); }, 3000); }); }; func1() .then((result) => { console.log(result); return func3(); }) .then((result) => { console.log(result); return func2(); }) .then((result) => { console.log(result); });