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 js 代码:

<script type="text/javascript">

var btn = document.getElementById("btn"),reset = document.getElementById("reset"),result = document.getElementById("Result2");

function ceshi(){

var man = document.getElementById("man"),woman = document.getElementById("woman"),father = document.getElementById("fh"),mother = document.getElementById("mh");

var g1 = document.getElementById("g1"),g2 = document.getElementById("g2");

//var isNum = /^-?d+(?:.d*)?(?:e[+-]?d+)?$/i;

var isNum =/^[0-9.]*$/;

 var parseF = parseInt(father.value);

 var parseM = parseInt(mother.value);

 if(parseF>=250||parseF<=55||parseM>=250||parseM<=55)

    {

     alert("您好 ！输入父母身高要都是55-250之间！");

     }

     else if(!isNum.test(father.value)||!isNum.test(mother.value)||father.value==''||mother.value=='')

     {

      alert('输入父母身高不是数字！');

      }

     else

     {

  if(man.checked){

   if(!isNum.test(father.value)) return;

   //g1.innerHTML = parseInt(((parseF+parseM)/2)*1);

   //alert(((parseF+parseM)/2)*1.16);

   g1.value=parseInt(((parseF+parseM)/2)*1);

   g2.value=parseInt(((parseF+parseM)/2)*1.16);

   //g2.innerHTML = parseInt(((parseF+parseM)/2)*1.16);

  }else if(woman.checked){

   if(!isNum.test(mother.value)) return;

   g1.value = parseInt((parseF*0.913+parseM)/2);

   g2.value = parseInt((parseF+parseM)/2);

  }else{

   alert('请选择性别！');

  }

     }

 }

 reset.onclick = function(){

  result.innerHTML = '未知';

  father.value = '例：175';

  mother.value = '例：165';

 

 };

 	

function resetw()

{

document.getElementById("fh").value='';

document.getElementById("mh").value='';

document.getElementById("g1").value='';

document.getElementById("g2").value='';

}

</script>

<table width="212" border="0" cellspacing="0" cellpadding="2">
  <tr>
    <td width="63" height="35" align="right">性　别：</td>
    <td width="67" height="35">
        <input type="radio" name="sex" value="1" id="man"/>男
    </td>
    <td width="70" height="35">
        <input type="radio" name="sex" value="0" id="woman"/>女
</td>
  </tr>
  <tr>
    <td width="63" height="35" align="right">父身高：</td>
    <td height="35" colspan="2">
      <label>
        <input type="text" name="fg" id="fh" style="width:100px; height:20px;" />厘米
        </label>
    </td>
    </tr>
  <tr>
    <td width="63" height="35" align="right">母身高：</td>
    <td height="35" colspan="2">
      <label>
        <input type="text" name="mg" id="mh" style="width:100px; height:20px;" />厘米
        </label>
</td>
    </tr>
  <tr>
    <td width="63" height="35" align="right">&nbsp;</td>
    <td height="35">
      <label>
        <input type="button" name="test" value="提交"  id="btn" onclick="ceshi()"/>
        </label>
 
    </td>
    <td height="35">
      <label>
        <input type="submit" name="Submit2" value="重置"  onclick="resetw()" />
        </label>
 
    </td>
  </tr>
</table>