菜鸟学堂
在线运行
源代码
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟学堂()</title> </head> <body> <p>对象可以设置为 <b>undefined</b> 来清空。</p> <p id="demo"></p> <script> var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}; var person = undefined; document.getElementById("demo").innerHTML = typeof person; </script> </body> </html>
运行结果
在线运行
菜鸟学堂 edu.jb51.net