<div id="first">

            外层

            <span id="second">

                内层

            </span>

        </div>

        <script type="text/javascript" src="js/jquery-3.1.1.min.js" ></script>

        <script>

            $("#first").click(function(){

                console.log("外层")

            })

            $("#second").click(function(event){

                event.stopPropagation();

                console.log("内层")

            })

        </script>