獲得錯誤的計算在JavaScript

我有如下表..但得到錯誤的計算在JavaScript ..獲得錯誤的計算在JavaScript

enter image description here

 <script> 
     function getPrice(tRate, tMaking, tHandeling, tPrice, tVat, tQuantity, tTotal) { 
      var obj_tRate = document.getElementById(tRate) 
      var obj_tMaking = document.getElementById(tMaking) 
      var obj_tHandeling = document.getElementById(tHandeling) 
      var obj_tPrice = document.getElementById(tPrice) 
      var obj_tVat = document.getElementById(tVat) 
      var obj_tTotal = document.getElementById(tTotal) 
      var obj_tQuantity = document.getElementById(tQuantity) 
      if (obj_tRate.value != "" && obj_tMaking.value != "" && obj_tHandeling.value != "") { 
       obj_tPrice.value = parseFloat(obj_tRate.value) + parseFloat(obj_tMaking.value) + parseFloat(obj_tHandeling.value); 
       console.log(obj_tPrice.value) 
       obj_tVat.value = parseFloat(obj_tPrice.value * (1/100)); 
       console.log(obj_tVat.value) 
       obj_tTotal.value = parseFloat(obj_tVat.value + (obj_tPrice.value * obj_tQuantity.value)); 
       console.log(obj_tTotal.value) 
      } 
      else { 
       obj_tPrice.value = ""; 
      } 
     } 

</script> 

</head> 
<body> 
    <table> 
     <tr> 
      <td> 
         <input name="grdView$ctl08$txtWaight_F" type="text" id="grdView_ctl08_txtWaight_F" class="classWaight" style="width:60px;" /> 
        </td><td> 
         <input name="grdView$ctl08$txtQuantity_F" type="text" maxlength="20" id="grdView_ctl08_txtQuantity_F" class="classQuantity" onchange="javascript:return getPrice('grdView_ctl08_txtRate_F','grdView_ctl08_txtMaking_F','grdView_ctl08_txtHandeling_F','grdView_ctl08_txtPrice_F','grdView_ctl08_txtvat_F','grdView_ctl08_txtQuantity_F','grdView_ctl08_txtTotal_F');" style="width:60px;" /> 
        </td><td> 
         <input name="grdView$ctl08$txtRate_F" type="text" maxlength="8" id="grdView_ctl08_txtRate_F" class="classRate" onchange="javascript:return getPrice('grdView_ctl08_txtRate_F','grdView_ctl08_txtMaking_F','grdView_ctl08_txtHandeling_F','grdView_ctl08_txtPrice_F','grdView_ctl08_txtvat_F','grdView_ctl08_txtQuantity_F','grdView_ctl08_txtTotal_F');" style="width:60px;" /> 
        </td><td> 
         <input name="grdView$ctl08$txtMaking_F" type="text" id="grdView_ctl08_txtMaking_F" class="classMaking" onchange="javascript:return getPrice('grdView_ctl08_txtRate_F','grdView_ctl08_txtMaking_F','grdView_ctl08_txtHandeling_F','grdView_ctl08_txtPrice_F','grdView_ctl08_txtvat_F','grdView_ctl08_txtQuantity_F','grdView_ctl08_txtTotal_F');" style="width:60px;" /> 
        </td><td> 
         <input name="grdView$ctl08$txtHandeling_F" type="text" id="grdView_ctl08_txtHandeling_F" class="classHandling" onchange="javascript:return getPrice('grdView_ctl08_txtRate_F','grdView_ctl08_txtMaking_F','grdView_ctl08_txtHandeling_F','grdView_ctl08_txtPrice_F','grdView_ctl08_txtvat_F','grdView_ctl08_txtQuantity_F','grdView_ctl08_txtTotal_F');" style="width:60px;" /> 
        </td><td> 
         <input name="grdView$ctl08$txtPrice_F" type="text" id="grdView_ctl08_txtPrice_F" class="classPrice" style="width:60px;" /> 
        </td><td> 
         <input name="grdView$ctl08$txtvat_F" type="text" id="grdView_ctl08_txtvat_F" class="classVat" style="width:60px;" /> 
        </td><td> 
         <input name="grdView$ctl08$txtTotal_F" type="text" id="grdView_ctl08_txtTotal_F" class="classTotal" style="width:100px;" /> 
        </td><td> 
         <input name="grdView$ctl08$txtSerial_F" type="text" id="grdView_ctl08_txtSerial_F" class="classSerial" /> 
        </td> 
     </tr> 
    </table> 
</body>

來源

2013-08-17 Nisar

您的意思是「VAT +（價格*數量）」？假設增值稅是總價值的一部分（因爲它通常是計算），我認爲你想要：數量*（價格+ VAT_RATE *價格） –

謝謝E.Anderson ..它將數量（價格+ VAT_RATE） – Nisar

使用parseFloat的操作數，而不是計算的結果。

例如，

var tPrice = parseFloat(obj_tPrice.value); 
var tQuantity = parseFloat(obj_tQuantity.value); 
obj_tTotal.value = tPrice + tPrice * tQuantity;

更換

obj_tTotal.value = parseFloat(obj_tVat.value + (obj_tPrice.value * obj_tQuantity.value));

當您添加，像你這樣，一個字符串和一個數字，你做字符串連接。

例如

"1000" + "5" * "100"

給

"1000" + 500

這是

"1000500"

此時，爲時已晚打電話parseFloat。

來源

2013-08-17 20:02:08

謝謝。 ..很好解釋。 – Nisar

獲得錯誤的計算在JavaScript

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