Home
JS
JS
Tryit: JAVASCRIPT
运行 ❯
×
Change Orientation
Change Theme, Dark/Light
<!DOCTYPE html> <html> <body> <h2>JavaScript 变量</h2> <p>没有值声明的变量将具有未定义的值。</p> <p id="demo"></p> <script> var carName; document.getElementById("demo").innerHTML = carName; </script> </body> </html>