JS::ToPrimitive 编辑
This article covers features introduced in SpiderMonkey 45
Converts a JavaScript object to a primitive value, using the semantics of ToPrimitive.
Syntax
bool
JS::ToPrimitive(JSContext *cx, JS::HandleObject obj, JSType hint,
JS::MutableHandleValue vp);
| Name | Type | Description |
|---|---|---|
cx | JSContext * | The context in which to perform the conversion. Requires request. In a JS_THREADSAFE build, the caller must be in a request on this JSContext. |
obj | JS::HandleObject | The object to convert. |
hint | JSType | The hint to pass to the ToPrimitive and @@toPrimitive method when converting the object. hint must be JSTYPE_STRING or JSTYPE_NUMBER to pass the corresponding type as a hint, or JSTYPE_VOID to pass no hint. Do not pass any other type. |
vp | JS::MutableHandleObject | Out parameter. On success, *vp receives the converted value. |
Description
JS::ToPrimitive converts a JavaScript object, obj, to a primitive value using ECMAScript 6 ToPrimitive.
On success, JS::ToPrimitive stores the converted value in *vp and returns true. On error or exception, it returns false, and the value left in *vp is undefined.
See Also
- MXR ID Search for
JS::ToPrimitive JS::GetFirstArgumentAsTypeHintJS_DefaultValue-- old name of this function- bug 1054756 - added
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