输入数量和价格自动计算输出金额的js代码_表单特效

<script> function checkInt(o){ theV=isNaN(parseInt(o.value))?0:parseInt(o.value); if(theV!=o.value){o.value=theV;} txtTotal.value=txtAmount.value*txtPrice.value; } function checkP(o){ theV=isNaN(parseFloat(o.value))?0:parseFloat(o.value); theV=parseInt(theV*100)/100; if(theV!=o.value){ theV=(theV*100).toString(); theV=theV.substring(0,theV.length-2)+"."+theV.substring(theV.length-2,theV.length) o.value=theV; } txtTotal.value=txtAmount.value*txtPrice.value; } </script> 数量: <input id="txtAmount" value="0" onkeyup="checkInt(this);" onpaste="checkInt(this);" oncut="checkInt(this);" ondrop="checkInt(this);" onchange="checkInt(this);"> 单价: <input id="txtPrice" value="0" onkeyup="checkP(this);" onpaste="checkP(this);" oncut="checkP(this);" ondrop="checkP(this);" onchange="checkP(this);" style="border-right-width:0px;margin-right:0px;"> <input style="border-left-width:0px;margin-left:-4px;width:18px" value="￥" readonly> 总价: <input id="txtTotal" value="0" style="border-right-width:0px;margin-right:0px;" readonly> <input style="border-left-width:0px;margin-left:-4px;width:18px" value="￥" readonly>
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