第一种写法

复制代码 代码如下:

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"> alert(str);</pre>

第二张写法

复制代码 代码如下:

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

复制代码 代码如下:

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

复制代码 代码如下:

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