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