JavaScript handler.preventExtensions() MethodThe handler.preventExtensions() method is used to trap the Object.preventExtensions method. When extensions are prevented on an object, new properties can't be added. SyntaxParameterstarget: The target object. Return valueReturn a Boolean value. Browser Support
Example 1Test it NowOutput: true Example 2Test it NowOutput: true [object Object] false Example 3Test it NowOutput: false false
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