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<!DOCTYPE html> <html> <body> <h1>JavaScript 对象</h1> <h2>Object.hasOwn() 方法</h2> <p>检查属性是否是对象的自有属性：</p> <p id="demo"></p> <script> const myObject = { age: 19, }; let text = Object.hasOwn(myObject, "age"); document.getElementById("demo").innerHTML = text; </script> </body> </html>