计算距离当前时间的方法

先上效果图

534696226676343687.jpg

关键实现代码如下：

/**
 * @param str 指定的时间字符串，如yyyy-MM-dd HH:mm:ss
 * */
 function $GetFriendlyTime(str) {
  var currentTime = new Date();
  var arr = str.split(/\s+/gi);
  var temp = 0, arr1, arr2, oldTime, delta;
  var getIntValue = function (ss, defaultValue) {
    try {
      return parseInt(ss, 10);
    } catch (e) {
      return defaultValue;
    }
  };
  var getWidthString = function (num) {
    return num < 10 ? ("0" + num) : num;
  };
  if (arr.length >= 2) {
    arr1 = arr[0].split(/[\/\-]/gi);
    arr2 = arr[1].split(":");
    oldTime = new Date();
    oldTime.setYear(getIntValue(arr1[0], currentTime.getFullYear()));
    oldTime.setMonth(getIntValue(arr1[1], currentTime.getMonth() + 1) - 1);
    oldTime.setDate(getIntValue(arr1[2], currentTime.getDate()));

    oldTime.setHours(getIntValue(arr2[0], currentTime.getHours()));
    oldTime.setMinutes(getIntValue(arr2[1], currentTime.getMinutes()));
    oldTime.setSeconds(getIntValue(arr2[2], currentTime.getSeconds()));

    delta = currentTime.getTime() - oldTime.getTime();

    if (delta < 0) {
      delta = Math.abs(delta)
    }

    if (delta <= 60000) {
      return "1分钟内";
    }
    else if (delta < 60 * 60 * 1000) {
      return Math.floor(delta / (60 * 1000)) + "分钟前";
    }
    else if (delta < 24 * 60 * 60 * 1000) {
      return Math.floor(delta / (60 * 60 * 1000)) + "小时前";
    }
    else if (delta < 3 * 24 * 60 * 60 * 1000) {
      return Math.floor(delta / (24 * 60 * 60 * 1000)) + "天前";
    }
    else if (currentTime.getFullYear() != oldTime.getFullYear()) {
      return [getWidthString(oldTime.getFullYear()), getWidthString(oldTime.getMonth() + 1), getWidthString(oldTime.getDate())].join("-")
    }
    else {
      return [getWidthString(oldTime.getFullYear()), getWidthString(oldTime.getMonth() + 1), getWidthString(oldTime.getDate())].join("-");
    }
  }
  return "";
}