http://es6.ruanyifeng.com/#do...這個(gè)是阮一峰老師關(guān)于Promise.resolve()參數(shù)的解讀,其中參數(shù)是thenable對(duì)象時(shí),Promise.resolve方法會(huì)將這個(gè)對(duì)象轉(zhuǎn)為 Promise 對(duì)象,然后就立即執(zhí)行thenable對(duì)象的then方法。問(wèn)題來(lái)了:new Promise(resolve => {resolve(1);Promise.resolve({ then: function(resolve, reject){ console.log(2);
resolve(3)
}
}).then(t => console.log(t))console.log(4);}).then(t => console.log(t));console.log(5);控制臺(tái)輸出:4 5 2 1 3下面按照最開(kāi)始的理解,將上述代碼進(jìn)行轉(zhuǎn)換new Promise(resolve => {resolve(1);new Promise(resolve=>{ console.log(2);
resolve(3)
}).then((t) => console.log(t));console.log(4);}).then(t => console.log(t));console.log(5);控制臺(tái)輸出 2 4 5 3 1順序不一樣。。我很崩潰 求解答
Promise.resolve的參數(shù)是thenable對(duì)象時(shí)
慕妹3146593
2019-01-29 23:19:12