在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

throw() method resumes the execution of a generator by throwing an error into it and returns an object with two properties done and value .

句法

gen.throw(exception)
					

参数

exception

The exception to throw. For debugging purposes, it is useful to make it an instanceof Error .

返回值

Object with two properties:

done (boolean)

• Has the value true if the iterator is past the end of the iterated sequence. In this case value optionally specifies the 返回值 of the iterator.
• Has the value false if the iterator was able to produce the next value in the sequence. This is equivalent of not specifying the done property altogether.

value

Any JavaScript value returned by the iterator. Can be omitted when done is true .

范例

使用 throw()

The following example shows a simple generator and an error that is thrown using the throw method. An error can be caught by a try...catch block as usual.

function* gen() {
  while(true) {
    try {
       yield 42;
    } catch(e) {
      console.log('Error caught!');
    }
  }
}
const g = gen();
g.next();
// { value: 42, done: false }
g.throw(new Error('Something went wrong'));
// "Error caught!"
// { value: 42, done: false }
						

规范

规范
ECMAScript (ECMA-262) The definition of 'Generator.prototype.throw' in that specification.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
throw	Chrome 39	Edge 13	Firefox 26	IE No	Opera 26	Safari 10	WebView Android 39	Chrome Android 39	Firefox Android 26	Opera Android 26	Safari iOS 10	Samsung Internet Android 4.0	nodejs 4.0.0 4.0.0 0.12 Disabled Disabled From version 0.12: this feature is behind the --harmony runtime flag.

图例

完整支持

完整支持

不支持

不支持

用户必须明确启用此特征。

用户必须明确启用此特征。

另请参阅

• function*

元数据

• 最后修改： Jan 15, 2020

相关话题

1. 标准内置对象
2. Generator
3. 方法
   1. Generator.prototype.next()
   2. Generator.prototype.return()
   3. Generator.prototype.throw()
4. 继承：
5. Function
6. 特性
   1. Function.arguments
   2. Function.caller
   3. Function.displayName
   4. Function.length
   5. Function.name
7. 方法
   1. Function.prototype.apply()
   2. Function.prototype.bind()
   3. Function.prototype.call()
   4. Function.prototype.toSource()
   5. Function.prototype.toString()
8. Object
9. 特性
   1. Object.prototype.__proto__
   2. Object.prototype.constructor
10. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()