答案是在文档中，你引用了两行之后：

  

open方法返回一个模式的实例，具有以下属性的对象：

  
  

  
• 关闭（结果） - 可以用来关闭模式的方法，通过结果

  
• 关闭（原因） - 可用于关闭模态的方法，传递一个原因

  
• 的结果 - 当一个模式被驳回时，一个模式是封闭的得到解决，拒绝承诺

  

  
  

最重要的一点是在这里发生了什么承诺。在接近，
  承诺解决 - 本质上，成功回调火灾。
  在辞退，许被拒绝，因此在运行失败
  回调来代替。

块引用>

What is the difference between "dismiss" a modal and "close" a modal?

close(result) - a method that can be used to close a modal, passing a result
dismiss(reason) - a method that can be used to dismiss a modal, passing a reason

The answer is in the documentation, right after the two lines you quoted:

The open method returns a modal instance, an object with the following properties:

• close(result) - a method that can be used to close a modal, passing a result
• dismiss(reason) - a method that can be used to dismiss a modal, passing a reason
• result - a promise that is resolved when a modal is closed and rejected when a modal is dismissed

The important bit here being what happens to the promise. On close, the promise is resolved - essentially, the "success" callback fires. On dismiss, the promise is rejected, therefore running the "failure" callback instead.