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                ## 一、概述 Promise 實例具有then方法,也就是說,then方法是定義在原型對象Promise.prototype上的。它的作用是為 Promise 實例添加狀態改變時的回調函數。前面說過,then方法的第一個參數是resolved狀態的回調函數,第二個參數(可選)是rejected狀態的回調函數。 >[danger] then方法返回的是一個新的Promise實例(注意,不是原來那個Promise實例)。因此可以采用鏈式寫法,即then方法后面再調用另一個then方法。 ## 二、實例 ``` getJSON("/posts.json").then(function(json) { return json.post; }).then(function(post) { // ... }); ```
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