javascript - 如果是Javascript，则始终返回2，如果

我正在运行基于HTML + JavaScript的页面。
这是我的代码：

  <script type="text/javascript">
/*var test = "Hello";
document.getElementById("mytext").value = test;
*/

function myFunction() {

var resultado;
var c1 = document.getElementById("mySelect").value;
var c2 = document.getElementById("mySelect2").value;
var c3 = document.getElementById("mySelect3").value;
if(c1 == "nao" , c2 == "nao" , c3 == "nao" ){
    resultado = 1;

}

else if(c1 == "nao" , c2 == "nao" , c3 == "sim" ){
    resultado = 2;

}

else if

(c1 == "nao" , c2 == "sim" , c3 == "sim" ){

    resultado = 3;
}

else {
    resultado = 4;
}
   document.getElementById("demo").innerHTML = resultado;

}



</script>
</script>


<form action="fb.php" method="POST">

<select name="test" id="mySelect" onchange="myFunction()">
<option value="selecione">selecione...</option>
<option value="sim">sim</option>
<option value="nao">nao</option>
<option value="jim">jim</option>

</select>
<select name="test" id="mySelect2" onchange="myFunction()">
<option value="selecione">selecione...</option>
<option value="sim">sim</option>
<option value="nao">nao</option>

</select>
<select name="test" id="mySelect3" onchange="myFunction()">
<option value="selecione">selecione...</option>
<option value="sim">sim</option>
<option value="nao">nao</option>

</select>

<p id="demo"></p>
</body>
</html>

第一个条件返回1，这很好。

但是，第三个条件(c1 == "nao" , c2 == "sim" , c3 == "sim")始终返回2。

我有个小提琴：https://jsfiddle.net/qoL6e0ca/

有人可以帮我吗？

最佳答案

iF语句的Anding与&&一样使用if(c1 == "nao" && c2 == "nao" && c3 == "sim" )