本文实例为大家分享了4种js计算系统当前日期是星期几的方法，供大家参考，具体内容如下
方法一：
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// 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：
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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：
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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：
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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);
