要领一：

// 盘算体系当前是礼拜几
var str = "今天是礼拜" + "日一二三四五六".charat(new Date().getDay());

要领二：

var a = new array("日", "一", "二", "三", "四", "五", "六");
var week = new Date().getDay();
var str = "今天是礼拜"+ a[week];
alert(str);

要领三：

var str = "今天是礼拜";
var week = new Date().getDay();
switch (week) {
        case 0 :
                str += "日";
                break;
        case 1 :
                str += "一";
                break;
        case 2 :
                str += "二";
                break;
        case 3 :
                str += "三";
                break;
        case 4 :
                str += "四";
                break;
        case 5 :
                str += "五";
                break;
        case 6 :
                str += "六";
                break;
}
alert(str);

要领四：

var str = "";
var week = new Date().getDay();
if (week == 0) {
        str = "今天是礼拜日";
} else if (week == 1) {
        str = "今天是礼拜一";
} else if (week == 2) {
        str = "今天是礼拜二";
} else if (week == 3) {
        str = "今天是礼拜三";
} else if (week == 4) {
        str = "今天是礼拜四";
} else if (week == 5) {
        str = "今天是礼拜五";
} else if (week == 6) {
        str = "今天是礼拜六";
}
alert(str);

固然这四种要领的圆满水平是一览无余的。