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<!DOCTYPE html> <html> <body> <p>删除运算符从对象中删除属性。</p> <p id="demo"></p> <script> var person = { firstname:"John", lastname:"Doe", age:50, eyecolor:"blue" }; delete person.age; document.getElementById("demo").innerHTML = person.firstname + " is " + person.age + " years old."; </script> </body> </html>