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$(".fa span").each(function(i){
$(this).click(function(){
console.log(i)
});
});
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>测试span单击事件</title>
<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.8.0.js"></script>
<script>
$(document).ready(function () {
$(".fa span").click(function () {
console.log("这是第" + ($(this).index() + 1) + "个span");
});
})
</script>
</head>
<body>
<div class="fa">
<span>1</span>
<span>2</span>
<span>3</span>
</div>
</body>
</html>