请问如何用onchange事件实现对公、母猪比例的计算？onestab(┼─)请进，各位大虾请进

text没有onchange事件，用onkeypress吧。

解决方案 »

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你的有求还挺高。
<body>
<table id="tab1" border="1" height="144" width="494">
<tr align=center class=tr1>
<td  width="50" height="24" align="center"> </td>
<td  width="70" height="24" align="center">抽样体重</td>
<td  width="59" height="24" align="center">公数量</td>
<td  width="53" height="24" align="center" bgcolor="#C0C0C0">公比例</td>
<td  width="51" height="24" align="center">母数量</td>
<td  width="54" height="24" align="center" bgcolor="#C0C0C0">母比例</td>
<td  width="54" height="24" align="center">幼数量</td>
<td  width="52" height="24" align="center" bordercolor="#000000" bgcolor="#C0C0C0">幼比例</td>
</tr>
<tr align=center>
<td>猪</td>
<td><input type=text size=8 onblur="checkInput()"></td>
<td><input type=text size=7 onblur="checkInput()"></td>
<td> </td>
<td><input type=text size=6 onblur="checkInput()"></td>
<td> </td>
<td><input type=text size=6 onblur="checkInput()"></td>
<td> </td>
</tr>
<tr align=center>
<td>狗</td>
<td><input type=text size=8 onblur="checkInput()"></td>
<td><input type=text size=7 onblur="checkInput()"></td>
<td> </td>
<td><input type=text size=6 onblur="checkInput()"></td>
<td> </td>
<td><input type=text size=6 onblur="checkInput()"></td>
<td> </td>
</tr>
<tr align=center>
<td>羊</td>
<td><input type=text size=8 onblur="checkInput()"></td>
<td><input type=text size=7 onblur="checkInput()"></td>
<td> </td>
<td><input type=text size=6 onblur="checkInput()"></td>
<td> </td>
<td><input type=text size=6 onblur="checkInput()"></td>
<td> </td>
</tr>
<tr align=center>
<td width="50" height="21"><input type=button value=合计 onclick="sum()"></td>
<td width="70" height="21"> </td>
<td width="59" height="21"> </td>
<td width="53" height="21"> </td>
<td width="51" height="21"> </td>
<td width="54" height="21"> </td>
<td width="54" height="21"> </td>
<td width="52" height="21"> </td>
</tr>
</table>
<script>
function toNum(str){ //转换数字
n = parseInt(str);
if(isNaN(n)) n=0;
return n;
}function checkInput(){ // 检查输入，转换为数字
e=event.srcElement;
if(e.value.replace(/[0-9]/g,"").length>0){
  alert("只能是数字！");
  e.focus();
  return;
}
if(e.parentElement.cellIndex==0) return; // first cell
calRow(e.parentElement.parentElement.rowIndex);
}function calRow(rowNum){ // 计算某行数据
     var row = tab1.rows(rowNum);
var male=  toNum(row.cells(2).firstChild.value);
var female = toNum(row.cells(4).firstChild.value);
var child =  toNum(row.cells(6).firstChild.value);
     var s = male + female + child;
if(s>0){
     row.cells(3).innerText = Math.round(100*male/s) + "%";
     row.cells(5).innerText = Math.round(100*female/s) + "%";
     row.cells(7).innerText = Math.round(100*child/s) + "%";
     }
}function calCol(n){ //计算列之和
  var s=0;
  for(i=1;i<4;i++)
     s += toNum(tab1.rows(i).cells(n).firstChild.value);
  tab1.rows(4).cells(n).innerText = s;
}function sum(){  //汇总数据
  calCol(1); //计算1 2 3 6 列数据之和
  calCol(2);
  calCol(4);
  calCol(6);
  //计算总比例
  row = tab1.rows(4);
  male = toNum(row.cells(2).innerText);
  female = toNum(row.cells(4).innerText);
  baby = toNum(row.cells(6).innerText);
  s = male + female + baby;
  if(s>0){
     row.cells(3).innerText = Math.round(100*male/s) + "%";
     row.cells(5).innerText = Math.round(100*female/s) + "%";
     row.cells(7).innerText = Math.round(100*baby/s) + "%";
  }
}
</script>
</body>
哈哈，幸福的打滚！onblur是指焦点离开时触发的事件吗？努力学习！少问问题！
onblur亦可改成
onchange 或
onpropertychange