<!DOCTYPE html><html>?<head>? <title> 事件</title>? ? <script type="text/javascript">?? function count(){??? var txt1 = document.getElementById("txt1").value;??? var txt2 = document.getElementById("txt2").value;??? var c= document.getElementById("select").value;??? var result = "";??? switch(c) {??????? case "+":??????????? result = parseInt(txt1) + parseInt(txt2);??????????? break;??????? case "-":??????????? result = parseInt(txt1) - parseInt(txt2);??????????? break;??????? case "*":??????????? result = parseInt(txt1) * parseInt(txt2);??????????? break;??????? default:??????????? result = parseInt(txt1) / parseInt(txt2);??? }??? document.getElementById("fruit").value = result;? </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(diào)用創(chuàng)建的函數(shù)，得到結(jié)果--> ?? <input type='text' id='fruit'/>?? ?</body></html>
計算器實現(xiàn)不了，自己發(fā)現(xiàn)不出有啥錯誤~
慕仰3954884
2016-07-24 19:13:08
