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JavaScript 对象 toString() 方法
tryjsref_object_tostring2
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<!DOCTYPE html> <html> <body> <h1>JavaScript Objects</h1> <h2>The toString() Method</h2> <p>The toString() method returns "[object Type]" if it cannot return a proper string:</p> <p id="demo"></p> <script> const person = { firstName: "John", lastName: "Doe", age: 50, eyeColor: "blue" }; const keys = person.toString(); document.getElementById("demo").innerHTML = keys; </script> </body> </html>