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JS_New 编辑

This article covers features introduced in SpiderMonkey 1.8

Create an object as though by using the new keyword and a JavaScript function.

Syntax

JSObject *
JS_New(JSContext *cx, JS::HandleObject ctor, const JS::HandleValueArray& args); // Added in JSAPI 32

JSObject *
JS_New(JSContext *cx, JSObject *ctor, unsigned argc, jsval *argv); // Obsolete since JSAPI 32

Name	Type	Description
`cx`	`JSContext *`	The context in which to create the new object. Requires request. In a `JS_THREADSAFE` build, the caller must be in a request on this `JSContext`.
`ctor`	`JS::HandleObject`	The constructor function object.
`args`	`JS::HandleValueArray &`	An array of argument values to pass to the constructor. Added in SpiderMonkey 38
`argc`	`unsigned`	The number of arguments to pass to the constructor. Obsolete since JSAPI 32
`argv`	`jsval *`	Pointer to the element 0 of an array of argument values to pass to the constructor. If argc is `0`, this may be `NULL`. Obsolete since JSAPI 32

Description

JS_New creates a new object as though by using the new operator, as described in ECMA 262-3 §11.2.2.

JS_New(cx, ctor, args) is equivalent to the JavaScript expression new ctor(...args), and JS_New(cx, ctor, argc, argv) is equivalent to the JavaScript expression new ctor(argv[0], argv[1], ... argv[argc-1]). If ctor is not an object that can be used as a constructor, a TypeError is raised.

On success, JS_New returns a pointer to the new object. On error, it returns NULL.

JS_New 编辑

Syntax

Description

See Also

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友情链接

JS_New 编辑

Syntax

Description

See Also

如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

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友情链接

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。