$("#SpecialAptitude").on("change",function(){CheckType($(this))})$("#SpecialAptitude").on("change",CheckType($(this)))

为什么第一个有效果第二个没效果呢

实际上两种都是可以的

<!DOCTYPE html>
<html>
<head>
<script src="/jquery/jquery-1.11.1.min.js">
</script>
</head>
<body>
<button>a</button>
<select>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
</select>
<select Id="S2">
<option>a1</option>
<option>a2</option>
<option>a3</option>
<option>a4</option>
</select>
</body>
<script>
$(document).ready(function(){
  $("p").click(function(){
    $(this).hide();
  });
});
function notify() {
  alert( "clicked111" );
}
function notify2() {
  alert( "clicked222" );
}
function notify3() {
  alert( "clicked2223" );
}
$("button").on( "click", notify);
$("select").on( "change", notify2);
$("#S2").on( "change", function(){notify3()});
</script>
</html>

都行

$("#SpecialAptitude").on("change",CheckType($(this)))

只是不能加()

要想加参数

<!DOCTYPE html>
<html>
<head>
<script src="/jquery/jquery-1.11.1.min.js">
</script>
</head>
<body>
<button>a</button>
<select id="s1">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
</select>
<select Id="S2">
<option>a1</option>
<option>a2</option>
<option>a3</option>
<option>a4</option>
</select>
</body>
<script>
$(document).ready(function(){
  $("p").click(function(){
    $(this).hide();
  });
});
function notify() {
  alert( "clicked111" );
}

$("button").on( "click", notify);
$("#s1").on( "change",{
  name: "Karl"
},notify2);
$("#S2").on( "change", function(){notify3()});
function notify2(a) {
  alert( "clicked222"+a.data.name );
}
function notify3() {
  alert( "clicked2223" );
}
</script>
</html>

巴特西

$("#SpecialAptitude").on("change",function(){CheckType($(this))})$("#SpecialAptitude").on("change",CheckType($(this)))

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