js code to automatically calculate the output amount after inputting the quantity and price_Form special effects

<input id="txtAmount" value="0" onkeyup="checkInt(this);" onpaste="checkInt(this);" oncut="checkInt(this);" ondrop="checkInt(this);" onchange="checkInt(this);"> quantity: <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;"> unit price: <input style="border-left-width:0px;margin-left:-4px;width:18px" value="￥" readonly> <input id="txtTotal" value="0" style="border-right-width:0px;margin-right:0px;" readonly> Total price: <input style="border-left-width:0px;margin-left:-4px;width:18px" value="￥" readonly>
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]<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>