1. //   时间获取
    2.   getDay(day) {
    3.     var today = new Date();
    4.     var targetday_milliseconds = today.getTime() + 1000 * 60 * 60 * 24 * day;
    5.     today.setTime(targetday_milliseconds); //注意，这行是关键代码
    6.     var tYear = today.getFullYear();
    7.     var tMonth = today.getMonth();
    8.     var tDate = today.getDate();
    9.     tMonth = this.doHandleMonth(tMonth + 1);
    10.     tDate = this.doHandleMonth(tDate);
    11.     return tYear + "-" + tMonth + "-" + tDate;
    12.   },
    14.   doHandleMonth(month) {
    15.     var m = month;
    16.     if (month.toString().length == 1) {
    17.       m = "0" + month;
    18.     }
    19.     return m;
    20.   },
    23.   使用 this.getDay(-6) 近七天时间