<%@page contentType="text/html"%><%@page pageEncoding="UTF-8" prefix="area"%><!DOCTYPE html><%@ attribute name="radius" %><html><body> <form action="" id="form1"> 请输入半径: <input type="text" name="radius" id="radius"/><span id="item"></span><br><br> <input type="submit" value="计算" onclick="return myCheck()"/><br> </form> <%! public String getArea(double r){ double area; area=Math.PI*r*r; return "</br>面积:"+area; } %> <% out.println("圆的半径:"+radius); double r=Double.parseDouble(radius); out.println(getArea(r)); %> </body></html>
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