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                ## 一、概述 Promise.prototype.finally(),finally方法用于指定不管 Promise 對象最后狀態如何,都會執行的操作。該方法是 ES2018 引入標準的。 finally本質上是then方法的特例。 >[danger] 也就是說,無論promise的結果是成功還是出錯,finally里面的業務代碼都會被執行; ``` promise .finally(() => { // 語句 }); // 等同于 promise .then( result => { // 語句 return result; }, error => { // 語句 throw error; } ); ``` ## 二、概述 ``` promise .then(result => {···}) .catch(error => {···}) .finally(() => {···}); ```
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