js计算系统当前日期是星期几的方法

// 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());

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);

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);

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);