<!doctype html> <html> <head> <meta charset="utf-8"> <title>今天星期几</title> </head> <body> <script> //方案一 /*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);*/ //方案2 /*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);*/ //方案三 /*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);*/ //方案四 var str = '今天是星期' + '日一二三四五六'.charAt(new Date().getDay()); alert(str) </script> </body> </html>