<!DOCTYPE HTML><html>?? ?<head>?? ??? ??? ?<meta charset="utf-8"/>?? ??? ?<title>6編程練習(xí)</title>?? ??? ?</head>?? ??? ?<body>?? ??? ??? ?<script type="text/javascript">?? ??? ??? ??? ??? ?function tong(){?? ??? ??? ??? ?var a = parseInt(document.getElementById)("txt1").value);?? ??? ??? ??? ?var b = document.getElementById)("select").value;?? ??? ??? ??? ?var c = parseInt(document.getElementById)("txt2").value);?? ??? ??? ??? ?var result;?? ??? ??? ??? ?switch(b){?? ??? ??? ??? ?case "+":?? ??? ??? ??? ??? ?result = a + c;?? ??? ??? ??? ??? ?break;?? ??? ??? ??? ?case "-":?? ??? ??? ??? ??? ?result = a - c;?? ??? ??? ??? ??? ?break;?? ??? ??? ??? ?case "*":?? ??? ??? ??? ??? ?result = a * c;?? ??? ??? ??? ??? ?break;?? ??? ??? ??? ?default:?? ??? ??? ??? ??? ?result = a / c;?? ??? ??? ??? ?}?? ??? ??? ??? ?document.getElementById("adc").value = result;?? ??? ??? ?}?? ??? ??? ??? ??? ??? ??? ?</script>?? ??? ?<input type="text" id="txt1"/>?? ??? ?<select id="select">?? ??? ??? ??? ??? ?<option value="+">+</option>?? ??? ??? ?<option value="-">-</option>?? ??? ??? ?<option value="*">*</option>?? ??? ??? ?<option value="/">/</option>?? ??? ??? ??? ?</select>?? ??? ?<input type="text" id="txt2"/>?? ??? ?<input type="button" value="=" onclick="tong()"/>?? ??? ?<input type="text" id="adc"/>?? ??? ?</body></html>
急，在線(xiàn)等。彈不出結(jié)果。
同7七
2015-04-20 18:31:40
