JS_HasElement 编辑
Determine whether a JavaScript array has an element in the specified index.
Syntax
bool
JS_HasElement(JSContext *cx, JS::HandleObject obj, uint32_t index, bool *foundp);
| 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. |
foundp | bool * | Out parameter. On success, it stores true to *foundp, false otherwise. |
Description
JS_HasElement examines a specified JS object, obj, and its prototype chain, for an element or numeric property numbered index.
If the element exists, JS_HasElement sets *foundp to true. If not, it sets *foundp to false and returns true (to indicate no error occurred). If the search fails with an error or exception, JS_HasElement returns false, and the value left in *foundp is undefined.
See Also
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