<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>点击这里来创建变量，并显示结果。</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction(){ var carname="Volvo"; document.getElementById("demo").innerHTML=carname; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>假设 y=5，计算 x=y+2，并显示结果。</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction(){ var y=5; var x=y+2; var demoP=document.getElementById("demo"); demoP.innerHTML="x=" + x; } </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <script> var x=5; var y=6; var z=x+y; document.write(x + "<br>"); document.write(y + "<br>"); document.write(z + "<br>"); </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <script> var pi=3.14; var name="Bill Gates"; var answer='Yes I am!'; document.write(pi + "<br>"); document.write(name + "<br>"); document.write(answer + "<br>"); </script> </body> </html>
