js计算系统当前日期是星期几的几种方法

方法一：

// 计算系统当前是星期几var str = "今天是星期" + "日一二三四五六".charat(new date().getday());

方法二：

var a = new array("日", "一", "二", "三", "四", "五", "六");var week = new date().getday();var str = "今天是星期"+ a[week];alert(str);

方法三：

var str = "今天是星期";var week = new date().getday();switch (week) {        case 0 :    str1 += "日";    break;        case 1 :    str1 += "一";    break;        case 2 :    str1 += "二";    break;        case 3 :    str1 += "三";    break;        case 4 :    str1 += "四";    break;        case 5 :    str1 += "五";    break;        case 6 :    str1 += "六";    break;}alert(str);

方法四：

var str = "";var week = new date().getday();if (week == 0) {        str = "今天是星期日";} else if (week == 1) {        str = "今天是星期一";} else if (week == 2) {        str = "今天是星期二";} else if (week == 3) {        str = "今天是星期三";} else if (week == 4) {        str = "今天是星期四";} else if (week == 5) {        str = "今天是星期五";} else if (week == 6) {        str = "今天是星期六";}alert(str);

当然这四种方法的完美程度是一目了然的。