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JavaScript 2022 新特性
tryjs_obj_hasown
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<!DOCTYPE html> <html> <body> <h1>JavaScript Objects</h1> <h2>The Object.hasOwn() Method</h2> <p>Check if a property is the own property of an object:</p> <p id="demo"></p> <script> const myObject = { age: 50, }; let text = Object.hasOwn(myObject, "age"); document.getElementById("demo").innerHTML = text; </script> </body> </html>