正在加载图片...
<html> <head <script language="javascript"> var r=3 var pl=3.1415; document. write("半径为 br document. write("面积为:",r*r*pi); </script> </head> </html><html> <head> <script language="javascript"> var r=3; var pi=3.1415; document.write("半径为：",r,"<br>"); document.write("面积为：",r*r*pi); </script> </head> </html>