<!doctype html><html><head><meta charset="utf-8"><title>无标题文档</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>
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