JS_ForwardGetPropertyTo 编辑

This article covers features introduced in SpiderMonkey 17

Find a specified property and retrieve its value.

Syntax

bool
JS_ForwardGetPropertyTo(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
                        JS::HandleObject onBehalfOf, JS::MutableHandleValue vp);

bool
JS_ForwardGetElementTo(JSContext *cx, JS::HandleObject obj, uint32_t index,
                       JS::HandleObject onBehalfOf, JS::MutableHandleValue vp);

Description

JS_ForwardGetPropertyTo is the base implementation of JS_GetProperty, JS_GetUCProperty, JS_GetPropertyById etc, where onBehalfOf is same to obj.

onBehalfOf is Receiver in [[Get]] internal method of Proxy, defined in ES2015 draft spec (rev 29, 9.5.8).

On success, these functions set *vp to the current value of the property, or undefined 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

• MXR ID Search for JS_ForwardGetPropertyTo
• JS_GetProperty
• bug 698551