JS 日期操作代码，获取当前日期，加一天，减一天

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-type" content="text/html; charset=gb2312" /> 
<title>title</title> 
<body id="" onload=""> 
<input type="text" id="date" /> 
<input type="button" value="加" id="Add" /> 
<input type="button" value="减" id="Minus" /> 
<script type="text/javascript"> 
$ = function(o) { return typeof o === 'string' ? document.getElementById(o) : o }; 
//设置当前日期 
var ma = [['1','3','5','7','8','10'],['4','6','9','11']]; 
var dd = new Date(); 
var x = dd.toLocaleString(); 
var o = pasDate(x); 
$('date').value = o.join('-'); 
//转化日期函数 
function pasDate(da) { 
var yp = da.indexOf('年'), 
mp = da.indexOf('月'), 
dp = da.indexOf('日'); 
var y = da.substr(0,yp), 
m = da.substr(yp + 1,mp - yp - 1), 
d = da.substr(mp + 1,dp - mp - 1); 
return [y,m,d]; 
} 
//判断数组a是否存在在元素n 
function check(n,a) { 
for(var i = 0,len = a.length;i < len;i++) { 
if(a[i] == n) { 
return true; 
} 
} 
return false; 
} 
//闰?年? 
function isLeap(y) { 
return ((y % 4 == 0 && y % 100 != 0) || y % 400 == 0) ? true : false; 
} 
//实现加减f：'1'加，'0'减 
function trans(o,f) { 
var d = o.split('-'); 
var l = isLeap(d[0]); 
if(f == '1') { 
if((check(d[1],ma[0]) && (d[2] == '31')) || (check(d[1],ma[1]) && (d[2] == '30')) || 
(d[1] == '2' && d[2] == '28' && !l) || (d[1] == '2' && d[2] == '29' && l)) { 
return d[0] + '-' + (d[1] * 1 + 1) + '-' + 1; 
} else if(d[1] == '12' && d[2] == '31') { 
return (d[0] * 1 + 1) + '-' + '1-1'; 
} else { 
return d[0] + '-' + d[1] + '-' + (d[2] * 1 + 1); 
} 
} else if(f == '0') { 
if(check(d[1] - 1,ma[0]) && (d[2] == '1')) { 
return d[0] + '-' + (d[1] - 1) + '-' + '31'; 
} else if(check(d[1] - 1,ma[1]) && (d[2] == '1')) { 
return d[0] + '-' + (d[1] - 1) + '-' + '30'; 
} else if(d[1] == '1' && d[2] == '1') { 
return (d[0] - 1) + '-' + '12-31'; 
} else if(d[1] == '3' && d[2] == '1' && !l) { 
return d[0] + '-' + '2-28'; 
} else if(d[1] == '3' && d[2] == '1' && l) { 
return d[0] + '-' + '2-29'; 
} else { 
return d[0] + '-' + d[1] + '-' + (d[2] - 1); 
} 
} else { 
return; 
} 
} 
$('Add').onclick = function() { 
var v = $('date').value; 
$('date').value = trans(v,'1'); 
} 
$('Minus').onclick = function() { 
var v = $('date').value; 
$('date').value = trans(v,'0'); 
} 
</script> 
</body> 
</head> 
</html>

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