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                ## 題目 ### 模擬實現一個 Promise.finally ~~~js Promise.prototype.finally = function (callback) { let P = this.constructor; return this.then( value => P.resolve(callback()).then(() => value), reason => P.resolve(callback()).then(() => { throw reason }) ); }; ~~~ ## 摘自 [ 第 64 題:模擬實現一個 Promise.finally](https://www.muyiy.cn/question/async/64.html)
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