addEventListener is used to register the event processing program, which is attachEvent in IE. Why do we talk about addEventListener instead of attachEvent? Firstly, attachEvent is relatively simple, and secondly, addEventListener is the standard content in DOM. Today I will introduce to you a detailed explanation of the use of addEventListener in JavaScript!
(It should be noted that p must be placed in front of js)
Generally, if you bind the same event to a DOM object, only the last one will take effect. For example:
target: document node, document, window or XMLHttpRequest . type: String, event name, excluding "on", such as "click", "mouseover", "keydown", etc. listener: Implements the EventListener interface or a function in JavaScript. useCapture: Whether to use capture, usually false. For example:
document.getElementById("testText").addEventListener("keydown", function (event) { alert(event.keyCode); }, false);
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In IE:
target.attachEvent(type, listener);
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target: document node, document, window or XMLHttpRequest. type: String, event name, including "on", such as "onclick", "onmouseover", "onkeydown", etc. listener: Implements the EventListener interface or a function in JavaScript. For example: document.getElementById("txt").attachEvent("onclick",function(event){alert(event.keyCode);}); W3C and IE both support the removal of specified events. The purpose is to remove The formats of the set events are as follows:
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