求js大神指点迷津！解决办法

求js大神指点迷津！
[size=16px][size=14px]<!DOCTYPE html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
    <div id="myDate"></div>
    <script>
        var dd = new Array("一","二","三","四","五","六","日");

        var timer;
        function show_date(dateEle){
            var currDate = new Date();
            var time;
            time = currDate.getFullYear() + "年";
            time += (currDate.getMonth()+1) + "月";
            time += currDate.getDate() + "日" + "   ";
            time += "星期" + dd[currDate.getDay()-1] + "   ";
            time += addzero(currDate.getHours()) + ":";
            time += addzero(currDate.getMinutes()) + ":";
            time += addzero(currDate.getSeconds());
            dateEle.innerHTML = time;
            timer = setTimeout(function(){show_date.call(this,dateEle);},1000);
        }

        function addzero(i){
            if(i<10){
                return "0" + i;
            }
            return i;
        }

        window.onload = function(){
            if(document.getElementById("myDate")){
                var myDateEle = document.getElementById("myDate");
                show_date(myDateEle);
            }
        };
    </script>
</body>
</html>[/size][/size]

这是一个js时间自动跳秒的代码，其他的我都能看懂，就是上面加红的那段代码不明白，为什么要那样写？

因为动画不是setInterval方法吗？怎么是setTimeout了？

并且重点解释一下function(){show_date.call(this,dateEle); 这个是什么意思？
------解决思路----------------------
你打印一下this，这是调用自身的，递归。。。

求js大神指点迷津！解决办法

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