的JavaScript計算器警報不按0

-5

分我有0做一下不要鴻溝警報，怎麼辦呢的JavaScript計算器警報不按0

<!doctype html> 
<html lang="pl"> 
<head> 
<link rel="Stylesheet" type="text/css" href="style1.css" /> 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 
<title>ZAD 5 - Kalkulator</title> 
<meta name="owner" content="Adam Mika" /> 
<meta name="description" content="dskjadhjkhgkjdgkjgdkasgds" /> 
</head> 
<body> 
<div id="lewa"> 
MENU:<ul> 
<li><a href="zad1.html">Zadanie 1</a></li> 
<li><a href="zad2.html">Zadanie 2</a></li> 
<li><a href="zad3.html">Zadanie 3</a></li> 
<li><a href="zad4.html">Zadanie 4</a></li> 
<li><a href="zad5.html">Zadanie 5</a></li> 
</ul> 
</div> 
<div id="prawa"> 
ZADANIE 5 - Kalkulator 
<br></br> 
     <form name="kalk"> 
      <table align="center"> 
       <tr> 
        <td > 
         <input name="txtEkran" type="text" value=0 readonly /> 
        </td> 
       </tr> 
       <tr> 
        <td> 
         <input type="button" value=7 onclick="cyfraClick(7)" /> 
         <input type="button" value=8 onclick="cyfraClick(8)" /> 
         <input type="button" value=9 onclick="cyfraClick(9)" /> 
         <input type="button" value="/" onclick="operatClick('/')" /> 
        </td> 
       </tr> 
       <tr> 
        <td> 
         <input type="button" value=4 onclick="cyfraClick(4)" /> 
         <input type="button" value=5 onclick="cyfraClick(5)" /> 
         <input type="button" value=6 onclick="cyfraClick(6)" /> 
         <input type="button" value="*" onclick="operatClick('*')" /> 
        </td> 
       </tr> 
       <tr> 
        <td> 
         <input type="button" value=1 onclick="cyfraClick(1)" /> 
         <input type="button" value=2 onclick="cyfraClick(2)" /> 
         <input type="button" value=3 onclick="cyfraClick(3)" /> 
         <input type="button" value="-" onclick="operatClick('-')" /> 
        </td> 
       </tr> 
       <tr> 
        <td> 
         <input type="button" value=0 onclick="cyfraClick(0)" /> 
         <input type="button" value="=" onclick="rownaClick()" /> 
         <input type="button" value="+" onclick="operatClick('+')" /> 
         <input type="button" value="CE" onclick="kasuj('CE')" /> 
        </td> 
       </tr> 
      </table> 
     </form> 
     </div> 

     <script src="zad5.js"> 
     </script> 
     </body> 
    </html>

JS代碼

var formKalk = window.document.kalk; 
      var operat; 
      var cyfraPierwsza = true; 
      var walor1 = 0, walor2 = 0; 

      function cyfraClick(cyfra){ 
       if (cyfraPierwsza || formKalk.txtEkran.value == 0){ 
        formKalk.txtEkran.value = cyfra; 
        cyfraPierwsza = false; 
       }else{ 
        formKalk.txtEkran.value += cyfra; 
       } 
      } 

      function operatClick(opr){ 
       var txtEkran = formKalk.txtEkran.value; 
       walor1 = parseFloat(txtEkran); 
       operat = opr; 
       cyfraPierwsza = true; 
      } 

      function rownaClick(){ 
       var rezultat; 
       var txtEkran = formKalk.txtEkran.value; 
       walor2 = parseFloat(txtEkran); 
       if(operat == "/") { 
       rezultat = walor1/walor2; 
       }else if(operat == "*") { 
        rezultat = walor1 * walor2; 
       }else if(operat == "-"){ 
        rezultat = walor1 - walor2; 
       } 
       else { 
        rezultat = walor1 + walor2; 
       } 

       if(rezultat == Infinity) rezultat = 0; 




       formKalk.txtEkran.value = rezultat; 
       walor1 = rezultat; 
       cyfraPierwsza = true; 
      } 


      function kasuj(c){ 
       formKalk.txtEkran.value = 0; 
       cyfraPierwsza = true; 

       if (c == "C"){ 
        walor1 = 0; 
        operat = ""; 
       } 
      }

你覺得是什麼造成它？

來源

2016-10-16 Kamil Czaderna

造成**什麼**？ – Pointy

請閱讀[問]然後編輯的問題，並提供一個適當的問題陳述和解釋你的代碼是什麼 – charlietfl

我必須在JS中做關於不要除以0 –

這是一個相當簡單的解決方案 - 查看walor1在分割前是否具有零值。如果是這樣，告訴用戶不要除以零，並退出該功能。否則，請執行劃分。

if(operat == "/") { 
    if (walor2 == 0) { 
     alert("Please don't divide by zero."); 
     return; 
    } 
    rezultat = walor1/walor2; 
}

來源

2016-10-16 14:18:20

謝謝@Rohan Rao –

@KamilCzaderna沒問題:) –

的JavaScript計算器警報不按0

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