js多个输入框运算计算结果输出到另一个输入框

<div id="ckjrzy_4_14_15">
               <div id="ckjrzy_4_14_17">收益计算器
               </div>
               <div id="ckjrzy_4_14_30">
               <img src="images/zy/官方网改版---首页-2016_55_副本.jpg" />
               </div>
               周期:<input id="zhouqi" type="text" name="zhouqi"  />天
               投资金额: <input id="22" type="text" name="jine"  />元
               年化利率:   <input id="33" type="text" name="nianhua"  />%
              <input id="114" type="button" name="jisuan"  value="="  onclick="myFunction()"/>
              预计收益:    <input id="shouyi" type="text" name="shouyi"   value="" /></div>
          
            <input id="shouyi" type="text" name="shouyi2"   value="" />
 <script type="text/javascript">

function myFunction(){
       var zhouqi=document.getElementById("zhouqi").value;
    var jine=document.getElementById("22").value;
    var nianhua=document.getElementById("33").value;
    var sum = parseInt(nianhua)/365/100*parseInt(jine)*parseInt(zhouqi);
    document.getElementById("shouyi").value=sum;
}

</script>
<script language="javascript" type="text/javascript">
        <!--
        function f1(){
            var num1 = document.getElementsByTagName('input')[0].value;
            var num2 = document.getElementsByTagName('input')[1].value;
            var sum = parseInt(num1)+parseInt(num2);
            alert('和为:'+ sum);
        }
        //-->
  </script>
 </head>
 <body>
    <input type="text"/><br />
    <input type="text"/><br />
    <input type="button" value="求和" onclick="f1()"/>
 </body>
原文地址:https://www.cnblogs.com/linuxnewbie/p/5417098.html