Testing Properties To check whether an object has a property with a given name. You can do this with theinoperator, with thehasOwnProperty()andpropertyIsEnumerable()methods, 在JS中判斷一個對象是否包含某個屬性,可以使用in,hasOwnProperty() and propertyIsEnumerable() ...
www.dbjr.com.cn/article/1250...htm 2025-5-19