js判断对象是否存在某属性

正确：

JavaScript

Object.prototype.hasOwnProperty.call(obj, 'key')

1	Object.prototype.hasOwnProperty.call(obj, 'key')

报错：

JavaScript

Object.hasOwnProperty('key') // Do not access Object.prototype method 'hasOwnProperty' from target object

1 2	Object.hasOwnProperty('key') // Do not access Object.prototype method 'hasOwnProperty' from target object