js中使用eval()方法将字符串转换成日期格式、并获取指定时间的日期

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1、在js中eval()方法将字符串格式数据转换成日期格式

function getDate(strDate) {        //strDate为需要转换成日期格式的字符串        var date = eval('new Date(' + strDate.replace(/\d+(?=-[^-]+$)/,                function (a) { return parseInt(a, 10) - 1; }).match(/\d+/g) + ')');        return date;    }

2、获取当前日期的前一天日期

function getYestoday(date){        var yesterday_milliseconds=date.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;        }        datastr = strYear+"-"+strMonth+"-"+strDay;        return datastr;    }

3、获得上个月在昨天这一天的日期

function getLastMonthYestday(date){        var daysInMonth = new Array([0],[31],[28],[31],[30],[31],[30],[31],[31],[30],[31],[30],[31]);        var strYear = date.getFullYear();        var strDay = date.getDate();        var strMonth = date.getMonth()+1;        if(strYear%4 == 0 && strYear%100 != 0){            daysInMonth[2] = 29;        }        if(strMonth - 1 == 0)        {            strYear -= 1;            strMonth = 12;        }        else        {            strMonth -= 1;        }        strDay = daysInMonth[strMonth] >= strDay ? strDay : daysInMonth[strMonth];        if(strMonth<10)        {            strMonth="0"+strMonth;        }        if(strDay<10)        {            strDay="0"+strDay;        }        datastr = strYear+"-"+strMonth+"-"+strDay;        return datastr;    }

4、获得上一年在昨天这一天的日期

function getLastYearYestdy(date){        var strYear = date.getFullYear() - 1;        var strDay = date.getDate();        var strMonth = date.getMonth()+1;        if(strMonth<10)        {            strMonth="0"+strMonth;        }        if(strDay<10)        {            strDay="0"+strDay;        }        datastr = strYear+"-"+strMonth+"-"+strDay;        return datastr;    }

5、获得下个月在昨天这一天的日期

function getLastMonthYestdy2(date){        var daysInMonth = new Array([0],[31],[28],[31],[30],[31],[30],[31],[31],[30],[31],[30],[31]);        var strYear = date.getFullYear();        var strDay = date.getDate();        var strMonth = date.getMonth()+1;        if(strYear%4 == 0 && strYear%100 != 0){            daysInMonth[2] = 29;        }        if(strMonth + 1 == 13)        {            strYear += 1;            strMonth = 1;        }        else        {            strMonth += 1;        }        strDay = daysInMonth[strMonth] >= strDay ? strDay : daysInMonth[strMonth];        if(strMonth<10)        {            strMonth="0"+strMonth;        }        if(strDay<10)        {            strDay="0"+strDay;        }        datastr = strYear+"-"+strMonth+"-"+strDay;        return datastr;    }

6、测试

$(function() {        var strDate = '2014-06-11';        $("#test").html("用eval()方法将字符串转换为时间格式：" + getDate(strDate) + "<br/>" +                "获取当前日期的前一天日期：" + getYestoday(getDate(strDate)) + "<br/>" +                "获得上个月在昨天这一天的日期：" + getLastMonthYestday(getDate(strDate)) + "<br/>" +                "获得上一年在昨天这一天的日期：" + getLastYearYestdy(getDate(strDate)) + "<br/>" +                "获得下个月在昨天这一天的日期：" + getLastMonthYestdy2(getDate(strDate)) + "<br/>");    })

7、测试结果

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