<!-- 這是一個計算機 --><%@ page contentType="text/html; charset=gb2312" %><html><h1>計算機</h1><hr><script language = "javascript">function checkNum(){//alert("1");alert("0");if(document.form1.num1.value == ""){ //注意這裡只能使用 == 不能使用equals("")以為js中沒有equals函數alert("num為空白");return false;}//判斷輸入的的是不是數字if(Math.round(document.form1.num1.value) != document.form1.num1.value){alert("輸入的不是num1數字類型。請核實");return false;}if(Math.round(document.form1.num2.value) != document.form1.num2.value){alert("輸入的不是num2數字類型。請核實");return false;}if(document.form1.operator.value == "/" && document.form1.num2.value == 0){alert("除數不能為0");return false;}}</script><body><!-- 顯示結果 --><!-- <%//接受第一個運算數String strNum1 = request.getParameter("num1");//接受第二個雲算數String strNum2 = request.getParameter("num2");//System.out.println("strNum2="+ strNum2);//接受運算子String operator = request.getParameter("operator");//計算結果int num11=0, num22=0,result=0;out.println("12345");if(strNum1 != null && strNum2 != null && operator != null){out.println("不等於空=============");//return false;try{num11 = Integer.parseInt(strNum1);num22 = Integer.parseInt(strNum2);if(operator.equals("+")){result = num11 + num22;}else if(operator.equals("-")){result = num11 - num22;}else if(operator.equals("*")){result = num11 * num22;}else if(operator.equals("/")){result = num11/num22;}}catch(Exception e){e.printStackTrace();out.println("12345678");}// out.println(strNum1+operator+strNum2+"="+ result);} %> --><form name = "form1" action="myCal.jsp">請輸入第一個數：<input type="text" name="num1" value="<%=strNum1 %>"><br><select name = "operator"><option value=+>+</option><option value=->-</option><option value=*>*</option><option value=/>/</option></select><br>請輸入第二個數：<input type="text" name="num2" value="<%=strNum2 %>"><br><input type=submit onclick="return checkNum()" value="等於"></form> 結果：<%= strNum1%><%=operator %><%= strNum2%>=<%= result %></body></html>
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