<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>1</title><script type="text/javascript"> function count(){ var v1=document.getElementById("tet1").value; var v2=document.getElementById("tet2").value; var v3=document.getElementById("select").value; var v4; switch(v3) { case "+": v4=parseFloat(v1)+parseFloat(v2); break; case "-": v4=parseFloat(v1)-parseFloat(v2); break; case "*": v4=parseFloat(v1)*parseFloat(v2); break; case "/": v4=parseFloat(v1)/parseFloat(v2); break; default: break; } document.getElementById("fruit").value=v4; }</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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