今天是星期几的4种JS代码写法_javascript技巧

第一种写法

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";
}
name="code" class="javascript"> alert(str);

第二张写法

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);

第三种写法

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);

第四种写法

var str = "今天是星期" + "日一二三四五六".charAt(new Date().getDay());alert(str);