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JavaScript Object.defineProperty() 方法
tryjsref_object_defineprop
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<!DOCTYPE html> <html> <body> <h1>JavaScript Objects</h1> <h2>The Object.defineProperty() Method</h2> <p>This example adds a new property to an object.</p> <p id="demo"></p> <script> // Create an object: const person = { firstName: "John", lastName: "Doe", language: "EN" }; // Add a property Object.defineProperty(person, "year", {value:"2008"}) // Display the property document.getElementById("demo").innerHTML = person.year; </script> </body> </html>