Home >Web Front-end >JS Tutorial >JavaScript event handlers explained in detail

JavaScript event handlers explained in detail

小云云Original: 2018-02-08 13:24:411043browse

This article mainly introduces the relevant information of JavaScript event handler to you in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>DOM0级DOM2级</title>
</head>
<body>
<input id="btn1" type="button" value="click1" onclick="show()">
<input id="btn2" type="button" value="click2">
<input id="btn3" type="button" value="click3">
<script>
  function show() {
    alert("btn1");
  }
  //DOM0级
  var btn2 = document.getElementById("btn2");
  btn2.onclick = function () {
    alert("DOM0级btn2");
  };
  //DOM2级
  function show2() {
    alert("DOM2级btn3");
  }
  var btn3 = document.getElementById("btn3");
//  btn3.addEventListener("click",show2,false);
//  btn3.removeEventListener("click",show2,false);
  //ie事件处理程序
//  btn3.attachEvent("onclick",show2);
//  btn3.detachEvent("onclick",show2);
  //跨浏览器事件处理程序
  //能力检测
var eventUtil = {
    //添加具柄；
    addHandler:function (element,type,handler) {
      if (element.addEventListener){
        element.addEventListener(type,handler,false);
      }else if(element.attachEvent){
        element.attachEvent("on"+type,handler);
      }else {
        element["on"+type]=handler;
      }
    },
    //删除具柄；
    removeHandler:function (element,type,handler) {
      if (element.removeEventListener){
        element.removeEventListener(type,handler,false);
      }else if(element.detachEvent){
        element.detachEvent("on"+type,handler);
      }else {
        element["on"+type]=null;
      }
    }
};
eventUtil.addHandler(btn3,"click",show2);
eventUtil.removeHandler(btn3,"click",show2);
</script>
</body>
</html>

Related recommendations:

Vue methods and event handling issues

Detailed explanation of examples of event handlers in JavaScript

JavaScript study notes (5) Event flow and event processing function allocation of event processing

The above is the detailed content of JavaScript event handlers explained in detail. For more information, please follow other related articles on the PHP Chinese website!

JavaScript 事件

Statement：

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Previous article：vue and jquery monitor user input status code sharing in real timeNext article：vue and jquery monitor user input status code sharing in real time

See more

JavaScript event handlers explained in detail

Related articles