JS_GetElement 编辑
Find a specified numeric property of an object and return its current value.
Syntax
bool
JS_GetElement(JSContext *cx, JS::HandleObject obj, uint32_t index,
JS::MutableHandleValue vp);
| Name | Type | Description |
|---|---|---|
cx | JSContext * | The context in which to perform the property lookup. Requires request. In a JS_THREADSAFE build, the caller must be in a request on this JSContext. |
obj | JS::HandleObject | The object to search for the element. |
index | uint32_t | Index of the element to look up. |
vp | JS::MutableHandleValue | Out parameter. On success, *vp receives the current value of the element, if it exists, and undefined otherwise. |
Description
JS_GetElement examines a specified JS object, obj, and its prototype chain, for an element or numeric property numbered index.
If the element exists, JS_GetElement sets *vp to the element's current value. If not, it sets *vp to undefined and returns true (to indicate no error occurred). If the search fails with an error or exception, JS_GetElement returns false, and the value left in *vp is undefined.
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。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论