JS using the eval () method to convert a string to a date format and get the date of the specified time

1. In JS, the eval () method converts the string format data into a date format

function GetDate (strdate) {//strdate is a string that needs to be converted to a date format var date = eval (' New date (' + Strdate.replace ') (/\d+ (? =-[^ -]+$)/, function (a) {return parseint (A, 10)-1;}).        Match (/\d+/g) + ') ';    return date; }

2. Get the date of the day before the current date

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. Get the date last month on this day

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] =;        }        if (strMonth-1 = = 0)        {            Stryear-= 1;            Strmonth = n;        }        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. Get the date of last year on this day

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, get the date of next month on this day

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] =;        }        if (strmonth + 1 = =)        {            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. Testing

$ (function () {        var strdate = ' 2014-06-11 ';        $ ("#test"). HTML ("Use the eval () method to convert a string to a time format:" + getDate (strdate) + "<br/>" +                "gets the date before the current date:" + getyestoday ( GetDate (strdate) + "<br/>" +                "get the date last month on this day:" + getlastmonthyestday (getDate (strdate)) + "<br/>" +                "Get the date of last year on this day:" + getlastyearyestdy (getDate (strdate)) + "<br/>" +                "get the date of next month on this day:" + GetLastMonthYestdy2 (GetDate (strdate)) + "<br/>");    })

7. Test results