在此页

• 句法
• 描述
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

GeneratorFunction 构造函数 creates a new generator 函数 object. In JavaScript, every generator function is actually a GeneratorFunction 对象。

注意， GeneratorFunction is not a global object. It could be obtained by evaluating the following code.

Object.getPrototypeOf(function*(){}).constructor
					

句法

new GeneratorFunction ([arg1[, arg2[, ...argN]],] functionBody)
					

参数

arg1, arg2, ... arg N

Names to be used by the function as formal argument names. Each must be a string that corresponds to a valid JavaScript identifier or a list of such strings separated with a comma; for example " x ", " theValue ", or " a,b ".

functionBody

A string containing the JavaScript statements comprising the function definition.

描述

generator 函数 objects created with the GeneratorFunction constructor are parsed when the function is created. This is less efficient than declaring a generator function with a function* 表达式 and calling it within your code, because such functions are parsed with the rest of the code.

All arguments passed to the function are treated as the names of the identifiers of the parameters in the function to be created, in the order in which they are passed.

注意： generator 函数 created with the GeneratorFunction constructor do not create closures to their creation contexts; they are always created in the global scope.

When running them, they will only be able to access their own local variables and global ones, not the ones from the scope in which the GeneratorFunction constructor was called.

This is different from using eval with code for a generator function expression.

援引 GeneratorFunction 构造函数作为函数 (不使用 new 运算符) 有相同效果若把它作为构造函数进行援引。

范例

Creating a generator function from a GeneratorFunction() constructor

var GeneratorFunction = Object.getPrototypeOf(function*(){}).constructor
var g = new GeneratorFunction('a', 'yield a * 2');
var iterator = g(10);
console.log(iterator.next().value); // 20
					

规范

规范
ECMAScript (ECMA-262) The definition of 'GeneratorFunction' 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
GeneratorFunction	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 Yes

图例

完整支持

完整支持

不支持

不支持

另请参阅

• function* function
• function* 表达式
• Function
• function statement
• 函数表达式
• 函数和函数作用域

元数据

• 最后修改： May 13, 2020

相关话题

1. 标准内置对象
2. GeneratorFunction
3. 继承：
4. Function
5. 特性
   1. Function.arguments
   2. Function.caller
   3. Function.displayName
   4. Function.length
   5. Function.name
6. 方法
   1. Function.prototype.apply()
   2. Function.prototype.bind()
   3. Function.prototype.call()
   4. Function.prototype.toSource()
   5. Function.prototype.toString()
7. Object
8. 特性
   1. Object.prototype.__proto__
   2. Object.prototype.constructor
9. 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()