JS 获取星期几的四种写法

第一种写法

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

第二张写法

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]; document.getElementById("day").innerHTML=str;

第三种写法

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"; } document.getElementById("day").innerHTML=str;

第四种写法

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; } document.getElementById("day").innerHTML=str;

获取年月日时分秒星期并实时更新

//js获取日期 function NowTime() { var now= new Date(); var hours=now.getHours(); var minutes=now.getMinutes(); var year=now.getFullYear(); var month=now.getMonth(); var date=now.getDate(); //获取相应ID document.getElementById("minutes").innerHTML=hours+":"+minutes; document.getElementById("time_data").innerHTML=year+"年"+(month+1)+"月"+date+"日"; var str = "星期" + "日一二三四五六".charAt(new Date().getDay()) document.getElementById("day").innerHTML=str; } //页面加载调用 window.οnlοad=function(){ //每1秒刷新时间 setInterval("NowTime()",1000); }