http://es6.ruanyifeng.com/#do...這個是阮一峰老師關于Promise.resolve()參數的解讀,其中參數是thenable對象時,Promise.resolve方法會將這個對象轉為 Promise 對象,然后就立即執行thenable對象的then方法。問題來了: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);控制臺輸出:4 5 2 1 3下面按照最開始的理解,將上述代碼進行轉換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);控制臺輸出 2 4 5 3 1
Promise.resolve的參數是thenable對象時
慕碼人2483693
2019-01-29 23:23:26