<%@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>
NicholasCZakas
幻世唯一
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