实时输入数量+单价自动转换为货币形式并计算出总额

 <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>