<!DOCTYPE HTML><html> <head> <meta charset="utf-8"/> <title>6编程练习</title> </head> <body> <script type="text/javascript"> function tong(){ var a = parseInt(document.getElementById)("txt1").value); var b = document.getElementById)("select").value; var c = parseInt(document.getElementById)("txt2").value); var result; switch(b){ case "+": result = a + c; break; case "-": result = a - c; break; case "*": result = a * c; break; default: result = a / c; } document.getElementById("adc").value = result; } </script> <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="tong()"/> <input type="text" id="adc"/> </body></html>
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