addListener事件监听


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>Document</title>
</head>
<body>
    <button id="action-btn">123</button>
    <script>
    function addListener(target, type, handler) {
        if (target.addEventListener) {
            target.addEventListener(type, handler, false);
        } else if (target.attachEvent) {
            target.attachEvent("on" + type, handler);
        } else {
            target["on" + type] = handler;
        }
    }

    function doSomething() {
        //代码
        console.log("show");
    }

    var btn = document.getElementById("action-btn");
    addListener(btn, "click", doSomething);
    </script>
</body>
</html>

 


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