<script type="text/javascript"> function count(){ var a =document.getElementById("txt1").value; var b =document.getElementById("txt2").value; var c =document.getElementById("select").value; var d =""; switch(c){ case '+': d = parseFloat(a) + parseFloat(b); break; case "-"： d = parseFloat(a) - parseFloat(b); break; case "*": d = parseFloat(a) * parseFloat(b); break; default: d = parseFloat(a) / parseFloat(b); break; } document.getElementById("fruit").value = d; } </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()"/> <input type='text' id='fruit' /> </body>
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