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<!DOCTYPE html> <html> <body> <h1>JavaScript defineProperty()</h1> <p id="demo"></p> <script> // 创建对象： var person = { firstName: "Bill", lastName : "Gates", ?? language : "NO", }; // 更改属性： Object.defineProperty(person, "language", { value: "EN", writable : true, enumerable : false, configurable : true }); // 枚举属性： txt = ""; for (var x in person) { txt += person[x] + "<br>"; } document.getElementById("demo").innerHTML = txt; </script> </body> </html>