<script>
function opshuliang(){
var shuliang = document.getElementById("shuliang").value;
var shuliang2 = document.getElementById("shuliang2").value;
var shuliang3 = document.getElementById("shuliang3").value;
var s_shuliang = document.getElementById("s_shuliang");
if(shuliang==""){
shuliang = 0;
}
if(shuliang2==""){
shuliang2= 0;
}
if(shuliang3==""){
shuliang3= 0;
}
sum = parseFloat(shuliang)+parseFloat(shuliang2)+parseFloat(shuliang3);
s_shuliang.value = sum;
}
</script>
<table width="300" border="1" cellspacing="0" cellpadding="0">
<tr>
<td> </td>
<td>数量 </td>
<td>重量 </td>
</tr>
<tr>
<td> </td>
<td> <input type="text" id="shuliang" size="5" onkeyup="opshuliang();"/> </td>
<td> <input type="text" id="zhongliang" size="5" /> </td>
</tr>
<tr>
<td> </td>
<td> <input type="text" id="shuliang2" size="5" onkeyup="opshuliang();"/> </td>
<td> <input type="text" id="zhongliang2" size="5" /> </td>
</tr>
<tr>
<td> </td>
<td> <input type="text" id="shuliang3" size="5" onkeyup="opshuliang();"/> </td>
<td> <input type="text" id="zhongliang3" size="5" /> </td>
</tr>
<tr>
<td>合计 </td>
<td> <input type="text" id="s_shuliang" size="5" /> </td>
<td> <input type="text" id="s_zhongliang" size="5" /> </td>
</tr>
</table>
计算重量和计算数量类似,就不用写了。
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title></title>
<script>
function a(){
var sl = 0;
for(var i=0;i<shuliang.length;i++){
if(shuliang[i].value)
sl += parseInt(shuliang[i].value);
}
s_shuliang.value=sl;
var zl = 0;
for(var i=0;i<zhongliang.length;i++){
if(zhongliang[i].value)
zl += parseInt(zhongliang[i].value);
}
s_zhongliang.value=zl;
}
</script></head><body>
<table width="300" border="0" cellspacing="0" cellpadding="0">
<tr>
<td> </td>
<td>数量 </td>
<td>重量 </td>
</tr>
<tr>
<td> </td>
<td> <input name="shuliang" type="text" id="shuliang" size="5" /> </td>
<td> <input name="zhongliang" type="text" id="zhongliang" size="5" /> </td>
</tr>
<tr>
<td> </td>
<td> <input name="shuliang" type="text" id="shuliang" size="5" /> </td>
<td> <input name="zhongliang" type="text" id="zhongliang" size="5" /> </td>
</tr>
<tr>
<td> </td>
<td> <input name="shuliang" type="text" id="shuliang" size="5" /> </td>
<td> <input name="zhongliang" type="text" id="zhongliang." size="5" /> </td>
</tr>
<tr>
<td>合计 </td>
<td> <input name="s_shuliang" type="text" id="s_shuliang" size="5" /> </td>
<td> <input name="s_zhongliang" type="text" id="s_zhongliang" size="5" /> </td>
</tr>
</table>
<button onclick="a()"/>
</body>
</html>
如果你前面的zhongliang等ID是相同的要这么写
<table width="300" border="0" cellspacing="0" cellpadding="0">
<tr>
<td> </td>
<td>数量</td>
<td>重量</td>
</tr>
<tr>
<td> </td>
<td><input name="shuliang" type="text" id="shuliang" size="5" /></td>
<td><input name="zhongliang" type="text" id="zhongliang" size="5" /></td>
</tr>
<tr>
<td> </td>
<td><input name="shuliang" type="text" id="shuliang" size="5" /></td>
<td><input name="zhongliang" type="text" id="zhongliang" size="5" /></td>
</tr>
<tr>
<td> </td>
<td><input name="shuliang" type="text" id="shuliang" size="5" /></td>
<td><input name="zhongliang" type="text" id="zhongliang" size="5" /></td>
</tr>
<tr>
<td>合计</td>
<td><input name="s_shuliang" type="text" id="s_shuliang" size="5" /></td>
<td><input name="s_zhongliang" type="text" id="s_zhongliang" size="5" /></td>
</tr>
</table>
<input type="button" value="计算" onclick="getTotal()"><script>
function addAll(name1, name2){
var texts = document.getElementsByName(name1);
var sum = 0.0;
for(var i = 0;i < texts.length; i++){
texts[i].value = /^\s*$/.test(texts[i].value) ? "0" : texts[i].value;
if(isNaN(texts[i].value)){
alert("必须输入数字");
texts[i].focus();
return false;
}
sum += parseFloat(isNaN(texts[i].value) ? "0" : texts[i].value);
}
document.getElementsByName(name2)[0].value = sum;
}function getTotal(){
addAll("shuliang", "s_shuliang");
addAll("zhongliang", "s_zhongliang");
}
</script>