主页
JavaScript
JavaScript typeof 运算符
tryjs_typeof_undefined
运行 ❯
×
更改方向
保存代码
更改主题
<!DOCTYPE html> <html> <body> <h1>JavaScript Operators</h1> <h2>The typeof Operator</h2> <p>The data type of an undefined variable is undefined.</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = "The typeof car is " + typeof car; </script> </body> </html>