<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title> 事件</title> <script type="text/javascript"> function count(){ var x=document.getElementById("txt1").value; var y=document.getElementById("txt2").value; var z=document.getElementById("select").value; var result; switch(z){ case "+": result=parseInt(x) + parseInt(y); break; case "-": result=parseInt(x) - parseInt(y); break; case "*": result=parseInt(x) * parseInt(y); break; case "/": result=parseFloat(x) / parseFloat(y); return result; } 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()" /> <input type='text' id='fruit' /> </body></html>
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