JS_GetPropertyDefault 编辑

Obsolete since JSAPI 26
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

This article covers features introduced in SpiderMonkey 1.8.5

Finds a specified property and retrieves its value or provided default value.

Syntax

bool
JS_GetPropertyDefault(JSContext *cx, JSObject *obj, const char *name, jsval def,
                      JS::MutableHandle<JS::Value> vp);

bool
JS_GetPropertyByIdDefault(JSContext *cx, JSObject *obj, jsid id, jsval def,
                          JS::MutableHandle<JS::Value> vp);

Description

JS_GetPropertyDefault examines a specified JS object obj and its prototype chain for a property with the specified name.

On success, these functions set *vp to the current value of the property, or def if obj has no such property, and return true. On an error or exception, these functions return false, and the value left in *vp is undefined.

See Also

• bug 905774