如何在事件处理程序中获取 javascript 事件对象

Question

我有一个带有onclick参数的div：

<div onclick="some_function()"></div>

如何访问函数中的事件对象？我需要它来获取事件目标

function some_function() 
{
event = event || window.event;
var target = event.target || event.srcElement;
//does not work in IE and Firefox, but works in chrome
}

Answer 1

这样：

<div onclick="some_function(event)"></div>
function some_function(evt) 
{
    // do something with evt (the event passed in the function call)
}

请注意，参数名称必须在函数调用中event。在事件处理程序中，可以使用所需的名称。

一个活生生的例子：http://jsfiddle.net/davidbuzatto/KHyAb/

Answer 2

如果我们使用事件侦听器，那么在"this"中有html元素，在"event"中有事件对象。

<a id="mya" href="#">Link</a>
var myA= document.querySelector("#mya");
myA.addEventListener("click", some_function);
function some_funtion() {
  //Here the html element is: this
  //Here the event object is: event
  //event.target is not always equal to this
}
<div id="mydiv">click here <span>then here</span></div>
var myDiv = document.querySelector("#mydiv");
myDiv.addEventListener("click", other_function);
function other_function() {
    alert(this === event.target);
}    

Answer 3

使用事件访问目标。当心目标与当前目标问题：

https://developer.mozilla.org/en-US/docs/Web/API/Event/currentTarget

   <div onclick="some_function(event)"></div>
   function some_function(event) 
   {
       // event.target is the DOM element that triggered the event
   }

Answer 4

使用 event 和 this，两者

document.querySelector("div").addEventListener("click", function(event) {
  some_function(event, this);
  
}, false);
function some_function(currentEvent, currentObject) {
  alert("Object is: " + currentObject.nodeName);
  alert("Event is: " + currentEvent.type);
  
};

<div>Click Me</div>

Answer 5

<div onclick="some_function(this, event)"></div>
function some_function(elem, e) 
{
    //You have both: html element (elem), and object event (e)
    //elem is not always equal to e.target
}
<div onclick="alert(this === event.target);">click here <span>then here</span></div>