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                ## 一、概述 Promise.prototype.catch方法是.then(null, rejection)或.then(undefined, rejection)的別名,用于指定發生錯誤時的回調函數。 >[danger] 也就是說,你完全可以不使用catch方法,而是直接用足then的兩個參數,一個是成功的handler,一個是發生錯誤的handler即可; ## 二、實例 ~~~javascript getJSON('/posts.json').then(function(posts) { // ... }).catch(function(error) { // 處理 getJSON 和 前一個回調函數運行時發生的錯誤 console.log('發生錯誤!', error); }); ~~~
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