为什么不能弹出对话框?
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>alert</title> <script type="text/javascript"> function rec(){ var mychar="I love JavaScript"; alert(mychar); } </script> </head> <body> <input name="button" type="button" onClick="rec()" value="点击我,弹出对话框" /> </body> </html>
为什么不能弹出对话框?