JS计算系统当前日期是星期几的几种方法

Question

如题所述

Answer 1

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 :
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);

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);

Answer 2

(new Date()).getDay()