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js網(wǎng)頁(yè)版計(jì)算器的簡(jiǎn)單實(shí)現(xiàn)

更新時(shí)間：2013年07月02日 16:19:06 投稿：shangke

這篇文章介紹了網(wǎng)頁(yè)版計(jì)算器的簡(jiǎn)單實(shí)現(xiàn)代碼，有需要的朋友可以參考一下

<!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=gb2312" />

<title>計(jì)算器</title>

<script language="javascript" type="text/javascript">

 var clearFlag=false;

 function getNum(num){

 //alert(num);

  var objresult=document.getElementById("result");

  if(clearFlag){

   objresult.value="";

   clearFlag=false;

  }

 //alert(objresult);

 objresult.value+=num;

 }

function getResult(){

 var objresult=document.getElementById("result");

 objresult.value=objresult.value+"="+eval(objresult.value);

 clearFlag=true;

}

</script>

</head>

<body>

<table width="200" border="1" cellpadding="2">

  <tr>

    <td colspan="4"><input type="text" name="result" id="result" size="33"></td>

  </tr>

  <tr>

    <td width="56"><input type="button" value="  1   " onclick="getNum(1)"></td>

    <td width="56"><input type="button" value="  2   " onclick="getNum(2)"></td>

    <td width="51"><input type="button" value="  3   " onclick="getNum(3)"></td>

    <td width="58"><input type="button" value="  +   " onclick="getNum('+')"></td>

  </tr>

  <tr>

    <td><input type="button" value="  4   " onclick="getNum(4)"></td>

    <td><input type="button" value="  5   " onclick="getNum(5)"></td>

    <td><input type="button" value="  6   " onclick="getNum(6)"></td>

    <td><input type="button" value="  -   " onclick="getNum('-')"></td>

  </tr>

  <tr>

    <td><input type="button" value="  7   " onclick="getNum(7)"></td>

    <td><input type="button" value="  8   " onclick="getNum(8)"></td>

    <td><input type="button" value="  9   " onclick="getNum(9)"></td>

    <td><input type="button" value="  *   " onclick="getNum('*')"></td>

  </tr>

  <tr>

    <td><input type="button" value="  0   " onclick="getNum(0)"></td>

    <td><input type="button" value="  .   " onclick="getNum('.')"></td>

    <td><input type="button" value="  =   " onclick="getResult()"></td>

    <td><input type="button" value="  /   " onclick="getNum('/')"></td>

  </tr>

</table>

</body>

</html>