? <script type="text/javascript">
?/*? function count(){
????? ?
??? //獲取第一個輸入框的值
?? ?//獲取第二個輸入框的值
?? ?//獲取選擇框的值
?? ?//獲取通過下拉框來選擇的值來改變加減乘除的運算法則
??? //設置結果輸入框的值
?? ?
?? }*/
??? function count(){
????? ?

??? var number = document.getElementById("txt1").value;
?? ?
??? var number2 = document.getElementById("txt2").value;
?? ?
??? var xuanze = document.getElementById("select").value;
??? var result = "";
????? ?
??? if(xuanze == "+")
?????? {
??? var result = parseInt(number) + parseInt(number2);
?????? } else if(xuanze == "-")
??? {
??? var result = parseInt(number) - parseInt(number2);
??? }? else if (xuanze == "*")
??? {
??? var? result = parseInt(number) + parseInt(number2);
???? }?? else
??? {
??? var? result = parseInt(number) + parseInt(number2);
?? }
???? document.getElementById("fruit").value = result;
? ?
??? }
? ?
? ?
? </script>