JavaScript event handlers explained in detail-JS Tutorial-php.cn

JavaScript event handlers explained in detail

小云云

Release： 2018-02-08 13:24:41

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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>

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