【children_index】
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.7.1.js'></script>
<script type='text/javascript'>
$(function(){
var triggers = $('a');
triggers.on('click', function() {
var index = triggers.index($(this));
console.log(index)
});
});
</script>
</head>
<body>
<a href="#">0</a>
<a href="#">1</a>
<a href="#">2</a>
</body>
</html>
