点击运行
<!DOCTYPE html> <html> <body> <h1>JavaScript Object.defineProperty()</h1> <p>本例为对象添加了一个新属性。</p> <p id="demo"></p> <script> // 创建对象： var person = { firstName: "Bill", lastName : "Gates", language : "EN" }; // 添加属性： Object.defineProperty(person, "year", {value:"2019"}) document.getElementById("demo").innerHTML = person.year; </script> </body> </html>
运行结果
