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<!DOCTYPE html> <html> <body> <h1>JavaScript 对象是易变的</h1> <p>对对象副本的任何更改也将更改原始对象。</p> <p id="demo"></p> <script> var person = {firstName:"Bill", lastName:"Gates", age:62, eyeColor:"blue"} var x = person; x.age = 10; document.getElementById("demo").innerHTML = person.firstName + " is " + person.age + " years old."; </script> </body> </html>