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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

return() method returns the given value and finishes the generator.

句法

gen.return(value)
					

参数

value

The value to return.

返回值

The value that is given as an argument.

范例

使用 return()

The following example shows a simple generator and the return 方法。

function* gen() {
  yield 1;
  yield 2;
  yield 3;
}
const g = gen();
g.next();        // { value: 1, done: false }
g.return('foo'); // { value: "foo", done: true }
g.next();        // { value: undefined, done: true }
					

若 return( value ) is called on a generator that is already in "completed" state, the generator will remain in "completed" state.

If no argument is provided, the value property of returned object is the same as if .next() . If an argument is provided, it will be set to the value of the value property of the returned object.

function* gen() {
  yield 1;
  yield 2;
  yield 3;
}
const g = gen();
g.next(); // { value: 1, done: false }
g.next(); // { value: 2, done: false }
g.next(); // { value: 3, done: false }
g.next(); // { value: undefined, done: true }
g.return(); // { value: undefined, done: true }
g.return(1); // { value: 1, done: true }
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Generator.prototype.return' 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
return	Chrome 50	Edge 13	Firefox 38	IE No	Opera 37	Safari 10	WebView Android 50	Chrome Android 50	Firefox Android 38	Opera Android 37	Safari iOS 10	Samsung Internet Android 5.0	nodejs 6.0.0

图例

完整支持

完整支持

不支持

不支持

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()