IE9/Firefox/Safari/Chrome/Opera支持模拟触发自定义DOM事件

自定义DOM事件是在DOM3中定义的，它不是由DOM原生触发。自定义事件只能通过addEventListener方式添加，其它如内联到html或DOM0方式（el.onXXX=fn）添加的不能触发。如

<!-- 内联事件代码 -->
<div id="d1" onmyevent="alert(this)">DIV1</div>
<script>
    // DOM 0 方式添加
    d1.onmyevent = function(){alert(this)}
</script>

以下方式可以

<!DOCTYPE html>
<html>
    <head>
        <title>模拟DOM自定义事件</title>
        <meta charset="utf-8">
        <style>
            div {
                background: gold;
                margin: 10px;
            }
        </style>
    </head>
    <body>
        <!-- 内联事件代码 -->
        <div id="d1" onmyevent="alert(this)">DIV1</div>
        <script>
            function $(id) {return document.getElementById(id)}
            function hander(event) {
                alert(event.detail + this.tagName + '')
            }
            var div = $('d1'), customEvent
             
            div.onmyevent = function(){alert('DOM 0')}
            div.addEventListener('myevent', hander, false)
            document.body.addEventListener('myevent', hander, false)
             
            try {
                customEvent = document.createEvent('CustomEvent')
                customEvent.initCustomEvent('myevent', true, false, 'Hello, ')
                div.dispatchEvent(customEvent)
            } catch(e) {
                // 仅IE6/7/8不支持
                alert('Don\'t support DOM CustomEvent')
            }
        </script>
    </body>
</html>