源代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>享学课堂</title> </head> <body> <p id="demo"></p> <script> var car = ""; document.getElementById("demo").innerHTML = "The value is: " + car + "<br>" + "The type is: " + typeof car; </script> </body> </html>
运行结果