JS案例:计算圆的面积
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<!doctype html> <html> <head> <meta chaeset="utf8"> <title></title> </head> <body> <script type="text/javascript"> var r,s; r=prompt("请输入圆的面积:","0"); s=Math.PI*r*r; alert("半径为"+r+"的圆的面积为:"+s); </script> </body> </html>