今天是星期几的4种JS代码写法

第一种写法 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”