一个用来计算整星期日期的功能代码

效果图:

演示代码:

<html> 
<head> 
<title>日期插件</title> 
</head> 
<body> 
<script type="text/javascript"> 
function myDate() { 
function formatDate(d) { 
var _todayDate = d.getDate(); 
var _year = d.getYear(); 
!document.addEventListener || (_year += 1900); 
var _month = d.getMonth()+1; 
return _year+"-"+_month+"-"+_todayDate; 
} 
var now = new Date(), dd = new Date(); 
var n = now.getDay(); 
function check(date,m) { 
for (var i = 0;i < 7; i++) { 
var datevalue = now.getDate()-n+m+i+1; 
var month = now.getMonth()+1; 
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { 
if (datevalue > 31) { 
if ( m < 0 && month - 1 != 2) { 
dd.setDate(31-(30-datevalue)); 
dd.setMonth(month) 
} 
else 
{ 
dd.setDate(datevalue - 31); 
dd.setMonth(month); 
} 
} 
else 
{ 
dd.setDate(datevalue); 
} 
} 
else if (month == 4 || month == 6 || month == 9 || month == 11) 
{ 
if (datevalue > 30) { 
if ( m < 0 && month - 1 != 2) { 
dd.setDate(31-(30-datevalue)); 
dd.setMonth(month) 
} 
else 
{ 
dd.setDate(datevalue - 30); 
dd.setMonth(month); 
} 
} 
else 
{ 
dd.setDate(datevalue); 
} 
} 
else if (month == 2) { 
if (datevalue > 28) { 
dd.setDate(datevalue - 28); 
m >= 0 ? dd.setMonth(month+1) : dd.setMonth(month-1); 
} 
else 
{ 
dd.setDate(datevalue); 
} 
} 
date.push(formatDate(dd)); 
} 
} 
return { 
currWeek : function () { 
var date = []; 
check(date, 0); 
return date; 
}, 
nextWeek : function () { 
var date = []; 
check(date, 7); 
return date; 
}, 
prevWeek : function () { 
var date = []; 
check(date, -7); 
return date; 
} 
} 
} 
var s = new myDate(); 
document.write("上星期的每天日期："+s.prevWeek()+"<br>"+"本星期的每天日期；"+s.currWeek()+"<br>"+"下星期的每天日期："+s.nextWeek()); 
</script> 
</body> 
</html>

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