事件捕获

阻止捕获

document.getElementById("second").addEventListener("click",function(){
    alert("second");
    event.stopImmediatePropagation();
},true);   

链接

优秀文章：

• https://blog.csdn.net/sk_yi/article/details/107326653
• http://caibaojian.com/javascript-stoppropagation-preventdefault.html