how to alert the value of checkbox when it's checked

I want to alert the value of a specific input[checkbox] when an input[checkbox] is checked. I have many input checkbox. so when it's checked, alert will fire.

<input type="checkbox" value="1">
<input type="checkbox" value="2">
<input type="checkbox" value="3">
....

---

尝试这个：

$('input[type="checkbox"]').change(function() {
       if($(this).is(":checked")) {
          alert($(this).val())
          return;
       } 
}); 

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