22 lines
511 B
Markdown
22 lines
511 B
Markdown
|
---
|
|||
|
|
title: Promise Reject
|
|||
|
|
localeTitle: 承诺拒绝
|
|||
|
|
---
|
|||
|
|
## 承诺拒绝
|
|||
|
|
|
|||
|
|
`Promise.reject`函数向调用函数返回错误条件。它需要一个参数，一个Error对象或值作为拒绝的原因。
|
|||
|
|
|
|||
|
|
在Promise调用者的末尾链接catch函数将允许您捕获错误条件。
|
|||
|
|
|
|||
|
|
```javascript
|
|||
|
|
promiseCallingFunction(paramList)
|
|||
|
|
.then( ... )
|
|||
|
|
...
|
|||
|
|
.then( ... )
|
|||
|
|
.catch( function(err) { // catch function
|
|||
|
|
/*
|
|||
|
|
* this is where you can access the reason for the rejection
|
|||
|
|
*/
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
```
|