在页面中输出当前客户端时间

new Date();
Date.prototype.Format = function (fmt) {
    var arr = {
        "y+": this.getFullYear(),
        "m+": this.getMonth() + 1,
        "d+": this.getDate(),
        "h+": this.getHours(),
        "M+": this.getMinutes(),
        "s+": this.getSeconds(),
        "week": new Array("日", "一", "二", "三", "四", "五", "六")[this.getDay()]
    };
 
    for (var item in arr) {
        var val = arr[item] < 10 ? "0" + arr[item] : arr[item];
        fmt = fmt.replace(new RegExp(item), val);
    }
    return fmt
};
 
setInterval(function () {
    $("div").html(new Date().Format("yyyy/mm/dd hh:MM:ss 周week"));
}, 100);

对现在我的来说有点费解，只能大致明白它的原理...( ⊙ o ⊙ )啊！要疯啦