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> x = 5; // Assign 5 to x elem = document.getElementById("demo"); // Find an element elem.innerHTML = x; // Display x in the element var x; // Declare x </script> </body> </html>
运行结果