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Detailed explanation of examples of event handlers in JavaScript

黄舟Original: 2017-09-22 10:15:411107browse

This article mainly introduces the relevant information of JavaScript event handlers in detail, which has certain reference value. Interested friends can refer to it

The examples in this article share with you js event processing The specific code of the program is for your reference. The specific content is as follows

<!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>

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