错误（3,1）：PL / SQL：忽略SQL语句(Error(3,1): PL/SQL: SQL Statement ignored)

 捕获任何父元素中的委托事件 。 如果您在冒泡阶段到达之前未调用preventDefault ，则文档将获取所有事件。 阅读有关活动阶段的信息，它真的得到了回报！ 
 
$(document).on("click", "a", function(event) {

    // You have clicked an anchor
    window.console.log ("You have clicked this anchor:", this," but you clicked maybe inside a div or a something inside the <a>", event.target);

});
 
 https://jsfiddle.net/7ttm4y8k/4/ 
 
 注意：当您将事件委托给文档时，即使对于在设置处理程序之后添加的元素，这也将起作用。 这样，您可以设置委托的锚处理程序，然后可以在以后添加来自Ajax查询的锚点，而无需为每个创建的锚点设置处理程序。 

Capture delegated events in any parent element. Document will get all events if you don't call preventDefault before it arrives during the bubbling phase. Read about Event phases, it really pays off!
 
$(document).on("click", "a", function(event) {

    // You have clicked an anchor
    window.console.log ("You have clicked this anchor:", this," but you clicked maybe inside a div or a something inside the <a>", event.target);

});
 
https://jsfiddle.net/7ttm4y8k/4/
 
Note: As you are delegating the events to the document, this will work even for elements that were added after the handler's been set. This way you can setup your delegated anchor handler then maybe at a later time add anchors from an Ajax query without the need of setting handlers to every created anchor.