<!DOCTYPE html><html>?<head>? <title> 事件</title> ?? <script type="text/javascript">?? function count(){????? ???? var x=document.getElementById("txt1").value;??? var y=document.getElementById("txt2").value;??? var z=document.getElementById("select").value;??? var sum="";??? switch(z){??????? case "+":??????????? sum=parseInt(x)+parseInt(y);??????????? break;??????? case "-":??????????? sum=parseInt(x)-parseInt(y);???????????? break;??????? case "*":??????????? sum=parseInt(x)*parseInt(y);??????????? break;??????? default "/":??????????? sum=parseInt(x)/parseInt(y);??????? ???? }??? document.getElementById("fruit").value=sum;?? }? </script> ?</head> ?<body>?? <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="count()"/> <!--通過 = 按鈕來調用創建的函數，得到結果--> ?? <input type='text' id='fruit' />? ??</body></html>
JavaScript進階篇6-11練習，愁死我了死活運行不了
liaozixing007
2015-11-18 12:52:03
