addEvent()和addEventlistner()的区别

addEvent( object, eventType, function );

addEvent( document.getElementById('foo'), 'click', doSomething );
addEvent( obj, 'mouseover', function(){ alert('hello!'); } );

//绑定事件

function addEvent(el,name,fn){

if(el.addEventListener) return el.addEventListener(name,fn,false);//在火狐中会执行这一句
return el.attachEvent('on'+name,fn);//在ie中执行这一句

}

attachEvent方法，为某一事件附加其它的处理事件。（不支持Mozilla系列）

addEventListener方法用于 Mozilla系列

举例:

document.getElementById( " btn " ).onclick = method1;

document.getElementById( " btn " ).onclick = method2;

document.getElementById( " btn " ).onclick = method3;

如果这样写,那么将会只有medhot3被执行

写成这样：

var btn1Obj = document.getElementById( " btn1 " );

// object.attachEvent(event,function);

btn1Obj.attachEvent( " onclick " ,method1);

btn1Obj.attachEvent( " onclick " ,method2);

btn1Obj.attachEvent( " onclick " ,method3);

执行顺序为method3->method2->method1

如果是Mozilla系列，并不支持该方法，需要用到addEventListener

var btn1Obj = document.getElementById( " btn1 " );

// element.addEventListener(type,listener,useCapture);

btn1Obj.addEventListener( " click " ,method1, false );

btn1Obj.addEventListener( " click " ,method2, false );

btn1Obj.addEventListener( " click " ,method3, false );

执行顺序为method1->method2->method3

原文链接：https://blog.csdn.net/shueiyuan1983/article/details/52765014