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检查对象中是否存在键. JavaScript

检查对象中是否存在键. JavaScript

#JavaScript 


使用 in 运算符检查对象中是否存在键
JavaScript example code

JavaScript

  Output result 
The key exists.
使用 hasOwnProperty() 检查对象中是否存在键
JavaScript example code

JavaScript

  Output result 
The key exists.
code examples and answer to questions in JavaScript programming luaguage

JavaScript

JavaScript 编程语言中的代码示例和问题解答

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