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<!DOCTYPE html> <html> <body> <p>使用括号表示法修改 JavaScript 对象：</p> <p id="demo"></p> <script> var myObj, x; myObj = { name: "John", age: 30, city: "New York" }; myObj["name"] = "Gilbert"; document.getElementById("demo").innerHTML = myObj.name; </script> </body> </html>