<!doctype html><html><head><meta charset="utf-8"><title>無標(biāo)題文檔</title><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) ;}? ?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></html>
我的代碼有什么問題?
HoldSworder
2016-07-14 15:59:26