function*关键字可以在表达式内部定义一个生成器函数。

语法

function* [name]([param1[, param2[, ..., paramN]]]) {
   statements
}

参数

name
函数名。在声明匿名函数时可以省略。函数名称只是函数体中的一个本地变量。
paramN
传入函数的一个参数名。一个函数最多有 255 个参数。
statements
函数体。

描述

function*表达式和function* 声明比较相似,并具有几乎相同的语法。function*表达式和function*声明之间主要区别就是函数名,即在创建匿名函数时,function*表达式可以省略函数名。阅读函数章节了解更多信息。

示例

下面的示例定义了一个未命名的生成器函数并把它赋值给x。函数产出它的传入参数的平方:

var x = function*(y) {
   yield y * y;
};

规范

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
function*
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
function*
Draft  

浏览器兼容

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
function*Chrome Full support YesEdge Full support YesFirefox Full support 26IE No support NoOpera Full support YesSafari Full support 10WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 26Opera Android Full support YesSafari iOS Full support 10Samsung Internet Android Full support Yesnodejs Full support Yes
Trailing comma in parametersChrome Full support 58Edge ? Firefox Full support 52IE No support NoOpera Full support 45Safari ? WebView Android Full support 58Chrome Android Full support 58Edge Mobile ? Firefox Android Full support 52Opera Android Full support 45Safari iOS ? Samsung Internet Android Full support 7.0nodejs Full support 8.0.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

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