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[读码时间] 事件练习：封闭兼容性添加，删除事件的函数

说明：代码取自网络，注释为笔者学习时添加！

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>事件练习：封闭兼容性添加，删除事件的函数</title>
    <style>
        pre{
            color:green;
            padding:10px 15px;
            background:#f0f0f0;/*白色*/
            border:1px solid #333;/*黑色*/
            font:12px/1.5 Courier New;/*行高18*/
        }
        span{
            color:#999;/*灰黑色*/
        }
    </style>
    <script>
var EventUtil = {
    addHandler: function (oElement, sEvent, fnHandler) {
        oElement.addEventListener ? oElement.addEventListener(sEvent, fnHandler, false) : oElement.attachEvent("on" + sEvent, fnHandler)
    },
    removeHandler: function (oElement, sEvent, fnHandler) {
        oElement.removeEventListener ? oElement.removeEventListener(sEvent, fnHandler, false) : oElement.detachEvent("on" + sEvent, fnHandler)
    },
    addLoadHandler: function (fnHandler) {
        this.addHandler(window, "load", fnHandler)
    }
};
EventUtil.addLoadHandler(function () {
    var aBtn = document.getElementsByTagName("input");

    //为第一个按钮添加绑定事件
    EventUtil.addHandler(aBtn[1], "click", function () {
        EventUtil.addHandler(aBtn[0], "click", fnHandler);
        aBtn[0].value = "我可以点击了"
    });

    //解除第一个按钮的绑定事件
    EventUtil.addHandler(aBtn[2], "click", function () {
        EventUtil.removeHandler(aBtn[0], "click", fnHandler);
        aBtn[0].value = "毫无用处的按钮"
    });

    //事件处理函数
    function fnHandler ()
    {
        alert("事件绑定成功！")
    }
})
    </script>
</head>
<body>
    <pre>
&lt;script type="text/javascript"&gt;
var EventUtil = {
    addHandler: function (oElement, sEvent, fnHandler) {
        oElement.addEventListener ? oElement.addEventListener(sEvent, fnHandler, false) : oElement.attachEvent("on" + sEvent, fnHandler)    
    },
    removeHandler: function (oElement, sEvent, fnHandler) {
        oElement.removeEventListener ? oElement.removeEventListener(sEvent, fnHandler, false) : oElement.detachEvent("on" + sEvent, fnHandler)
    },
    addLoadHandler: function (fnHandler) {
        this.addHandler(window, "load", fnHandler)
    }
}
&lt;/script&gt;
</pre>
    <center><input type="button" value="毫无用处的按钮"> <input type="button" value="绑定click"> <input type="button" value="解除绑定"></center>
</body>
</html>

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原文地址：https://www.cnblogs.com/sx00xs/p/6487780.html