js计算输入日期的前一天，后一天(上一日，下一日)。兼容safari

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//下一天
function getNextday(){
var today=document.getElementById("lang0").value;
var t=new Date(today);
var tm=new Date(t.getFullYear(),t.getMonth(),t.getDate()+1);

var m='0'+(tm.getMonth()+1);
var d='0'+tm.getDate()

document.getElementById("lang0").value= tm.getFullYear()+'-'+m.substr(m.length-2)+'-'+d.substr(d.length-2);

}

//前一天
function getYestoday(date){
var date=document.getElementById("lang0").value;
var t=new Date(date);
var yesterday_milliseconds=t.getTime()-1000*60*60*24;
var yesterday = new Date();
yesterday.setTime(yesterday_milliseconds);
var strYear = yesterday.getFullYear();
var strDay = yesterday.getDate();
var strMonth = yesterday.getMonth()+1;
if(strMonth<10)
{strMonth="0"+strMonth;}
if(strDay<10)
{strDay="0"+strDay}
datastr = strYear+"-"+strMonth+"-"+strDay;
document.getElementById("lang0").value=datastr;

}

以上在Firefox和Chrome上都没有问题，但在safari上出错，找了一下原因，是需要将string的日期转换一下，如下：

//下一天

function getNextday(){
var today=document.getElementById("lang0").value;
var t = new Date(Date.parse(today.replace(/-/g, "/")));

var tm=new Date(t.getFullYear(),t.getMonth(),t.getDate()+1);

var m='0'+(tm.getMonth()+1);
var d='0'+tm.getDate()

document.getElementById("lang0").value= tm.getFullYear()+'-'+m.substr(m.length-2)+'-'+d.substr(d.length-2);

}

//前一天
function getYestoday(date){
var date=document.getElementById("lang0").value;
var t = new Date(Date.parse(date.replace(/-/g, "/")));

var yesterday_milliseconds=t.getTime()-1000*60*60*24;
var yesterday = new Date();
yesterday.setTime(yesterday_milliseconds);
var strYear = yesterday.getFullYear();
var strDay = yesterday.getDate();
var strMonth = yesterday.getMonth()+1;
if(strMonth<10)
{strMonth="0"+strMonth;}
if(strDay<10)
{strDay="0"+strDay}
datastr = strYear+"-"+strMonth+"-"+strDay;
document.getElementById("lang0").value=datastr;
}

参考：http://www.blogjava.net/swingboat/archive/2007/02/28/101076.html