<script type="text/javascript">
function count(){
var a = parseFloat(document.getElementById("c-price").value);
var b = parseFloat(document.getElementById("c-number").value);
var c = a*b;
var d ;
d = c.toFixed(2);
document.getElementById("c-sumprice").value = d;
}
</script>

<div>
<input data-rule="required" step="0.001" type="number" value="{$row.sumprice|htmlentities}">
</div>

最常用的表单相乘js保存2位小数