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<!DOCTYPE html> <html> <body> <h1>JavaScript 对象</h1> <h2>toString() 方法</h2> <p>如果 toString() 方法不能返回正确的字符串，则返回 "[object Type]"：</p> <p id="demo"></p> <script> const person = { firstName: "Bill", lastName: "Gates", age: 19, eyeColor: "blue" }; const keys = person.toString(); document.getElementById("demo").innerHTML = keys; </script> </body> </html>