<!DOCTYPE html><html> <head> <title> 事件</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; switch(c) { case "+": document.getElementById("fruit").value=parselnt(a)+parselnt(b); break; case "-": document.getElementById("fruit").value=parselnt(a)-parselnt(b); break; case "*": document.getElementById("fruit").value=parselnt(a)*parselnt(b); break; case "/": document.getElementById("fruit").value=parselnt(a)/parselnt(b); break; } } </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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