在哪里添加toFixed精确！！！！！！！！！！！！！！
出现了这种情况 按理说 不能的啊 但是不知道原因 所以想给他精切到俩位
//更新合计和差距
tdAges.each(function (index) {
tdSums.eq(index).html((parseFloat(this.innerHTML) || 0) + (sum[index] || 0));
tdDiffs.eq(index).html((parseFloat(this.innerHTML) || 0) - (sum[index] || 0));
});
我是在这里加toFixed 但是他会出现 033.00 这样的结果 所以问问你们在那加
js贴在下面吧
像钱这样的数据。一般都保留两位小数，所以一般所有用的钱的数字都要通过这样进行控制小数位。parseFloat(原生数字).toFixed(2)
<body>
<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.2.min.js"></script>
<script>
var food = {
请选择:{
请选择:[]
},
谷物: {
大米: [343,7.7,0.6,76.8,0,0.6,11,1.1,121,97,2.4,0.19,34,1.45,2.5,0,0.33,0.08,0.2,20,8,0,1.01,220,0,0,0,3.8,0.6,1.5],
小麦: [350,9.4,1.4,75,0,2.8,25,0.6,162,127,0.2,0.26,32,0.2,0.2,11,0.24,0.07,0.05,17.3,0,0,0.3,185,0,0,0,8,0.7,0.47],
玉米: [196,4,2.3,4.2,0,10.5,1,0.5,187,238,1.1,0.25,96,0.9,1.63,63,0.21,0.06,0.11,15,10,0,1.7,216,1,0,0.34,12,1.9,1.6],
小米: [359,9.2,3.2,73.3,0,1.6,9,5.6,240,239,9,0.54,107,2.08,4.74,17,0.67,0.12,0.18,73,0,0,3.63,143,0,0,0.19,29,1.7,1.6],
糯米: [345,7.3,1.4,77.5,0,0.8,26,6.7,155,231,1.5,0.25,49,1.54,2.71,0,0.19,0.03,0.04,23,0,0,1.29,120,0,0,0,7,0.5,2],
黑米: [339,8.9,2.2,70.8,0,2.8,12,1.6,179,256,7.1,0.15,147,3.8,3.2,19,0.41,0.33,0.54,104,32,0,0.6,270,0,0,3.87,15,0.2,2.3],
燕麦: [367,15,6.7,61.6,0,5.3,186,7,291,214,3.7,0.45,177,2.59,4.31,420,0.3,0.13,0.16,54.4,0,0,307,73,0,0,0,25,1.1,1.2],
薏米: [357,12.8,3.3,69.1,0,2,42,3.6,217,238,3.6,0.29,88,1.68,3.07,416,0.33,0.5,0.07,150,0,0,2.08,0,0,0,0,16,0.16,2],
芡实: [144,9.8,0.2,75,0,0.4,9,0.4,110,134,2.3,0.12,8,1.72,2.28,10,0.4,0.08,0.02,110,6,0,0,0,0,0,0.02,18,0.52,2.5],
荞麦: [324,9.3,2.3,66.5,0,6.5,47,6.2,297,401,4.7,0.56,258,0.56,3.62,13,0.28,0.16,0.35,0.02,0,0,4.4,0.2,0,0.33,2.4,44,1.54,2.2]
},
//....更加多食物种类
};
//岁数数组中的营养和上面列出的一致
var age = {
请选择: [],
'1-7岁': {
"女": [1600,55,30,0,300,0,800,10,700,1500,900,8.66,25,90,1,0.8,30,20,600,0.7,0.7,0.6,1.2,70,10,28.5,16,200,3,9],
"男": [1700,55,30,0,300,0,800,10,700,1500,900,8.66,25,90,1,0.8,30,20,600,0.7,0.7,0.6,1.2,70,10,25.5,16,200,3,9]
},
};
</script>
食品：<select id="food1"></select><select id="food2"></select><input type="button" value="添加" onclick="addFood()" /><br />
年龄段：<select id="age"></select> <select id="sex">
<option >请选择</option>
<option value="男">男</option>
<option value="女">女</option>
</select><br />
<table id="tab_Test3" border="1" width="1000px">
<tr class='tabTh'>
<td width="100px">食品名称</td>
<td width="100px">热量</td>
<td width="100px">蛋白质</td>
<td width="100px">脂肪</td>
<td width="100px">碳水化合物</td>
<td width="100px">胆固醇</td>
<td width="200px">膳食纤维</td>
<td width="100px">钙</td>
<td width="100px">铁</td>
<td width="100px">磷</td>
<td width="100px">钾</td>
<td width="100px">钠</td>
<td width="100px">铜</td>
<td width="100px">镁</td>
<td width="100px">锌</td>
<td width="100px">硒</td>
<td width="100px">维生素A</td>
<td width="100px">维生素B1</td>
<td width="100px">维生素B2</td>
<td width="100px">维生素B6</td>
<td width="100px">维生素B12</td>
<td width="100px">维生素C</td>
<td width="100px">维生素D</td>
<td width="100px">维生素E</td>
<td width="100px">生物素</td>
<td width="100px">维生素K</td>
<td width="100px">维生素P</td>
<td width="100px">胡萝卜素</td>
<td width="100px">叶酸</td>
<td width="100px">泛酸</td>
<td width="100px">烟酸</td>
<td width="100px">操作</td>
</tr>
<tr align='center' id="trSum">
<td>合计</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
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<td></td>
</tr>
<tr align='center' id="trAge">
<td>人体正常值</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
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<td></td>
</tr>
<tr align='center' id="trDiff">
<td>差距值</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
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<td></td>
</tr>
<tbody id="tbFood"></tbody>
</table>
<script>
var sFood1 = $('#food1'), sFood2 = $('#food2'), sAge = $('#age'), sSex = $('#sex')
//去掉第一个名列和最后一个操作列
, tdSums = $('#trSum td:gt(0)').not(':last')
, tdAges = $('#trAge td:gt(0)').not(':last')
, tdDiffs = $('#trDiff td:gt(0)').not(':last')
//////
, tbFood = $('#tbFood')
//初始化食品一级分类及事件
for (attr in food) sFood1.append('<option value="' + attr + '">' + attr + '</option>');
sFood1.change(function () {
var arr = food[this.value];
sFood2.html('');
for (attr in arr) sFood2.append('<option value="' + attr + '">' + attr + '</option>');
}).trigger('change');//触发一级分类加载2级分类
//初始化年龄段
for (attr in age) sAge.append('<option value="' + attr + '">' + attr + '</option>');
sAge.add('#sex').change(function () {///////
var arr = sAge.val() == '请选择' ? age['请选择'] : age[sAge.val()][sSex.val()];
//sAge1.html('');
//for (attr in arr) sAge1.append('<option value="' + attr + '">' + attr + '</option>');
tdAges.each(function (index) { this.innerHTML = arr[index]; });
updateSumDiff();
});//触发onchange更新trAge中的td数值
function updateSumDiff() {//更新合计和差距
var sum = [];//每营养小计
tbFood.find('tr').each(function () {
$('td:gt(0)', this).not(':last').each(function (index) {
sum[index] = (parseFloat(this.innerHTML) || 0) + (sum[index] || 0);
});
});
//更新合计和差距
tdAges.each(function (index) {
tdSums.eq(index).html((parseFloat(this.innerHTML) || 0) + (sum[index] || 0));
tdDiffs.eq(index).html((parseFloat(this.innerHTML) || 0) - (sum[index] || 0));
});
}
function addFood() {
var arr = food[sFood1.val()][sFood2.val()];
var s = '<tr><td>' + sFood2.val() + '</td>';
for (var i = 0; i < arr.length; i++) s += '<td>' + arr[i] + '</td>';
s += '<td><input type="button" value="删除" onclick="removeFood(this)"/></td></tr>';
tbFood.append(s);
updateSumDiff();
}
function removeFood(o) { $(o).closest('tr').remove(); updateSumDiff(); }
</script>
</body>
怎么 没有人回答啊 js 是个完整的例子