javaScript变量 用 var操作符声明
<!DOCTYPE html> <html> <head> <title>javaScript变量</title> </head> <body> <script type="text/javascript"> var x=3; document.write(x); </script> </body> </html>
<!DOCTYPE html> <html> <head> <title>javaScript变量</title> </head> <body> <script type="text/javascript"> var x=3; document.write(x); </script> </body> </html>