js中使用eval()步骤将字符串转换成日期格式、并获取指定时间的日期

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

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