JavaScript 日期

Question

如何将代码document.write("直到指定日期")更改为writeMessage(date)中的日期？此外，writeMessage(date) 中的日期未正确显示(仅显示年份)。感谢您帮助解决此问题!

function beginMessage(number, timeType) {
  if (number > 0) {
  document.write("There are ");
  document.write(number);
  document.write(" ");
  document.write(timeType);
  document.write(" until the designated date.");
  document.write("<br>");
} else {
  number = -number;
  document.write("There have been ");
  document.write(number);
  document.write(" ");
  document.write(timeType);
  document.write(" since the designated date.");
  document.write("<br>");
}

  if (((timeType === undefined || number === undefined || isNaN(number)))) {
    document.body.innerHTML = "";
  }
}

function writeMessage(date) {
  clearDocument();
  var today = new Date();
  var calculateDate = new Date(date);

  var milliseconds = calculateDate.getTime() - today.getTime();

  beginMessage(milliseconds, "milliseconds");

  var seconds = milliseconds / 1000;
  seconds = parseInt(seconds);

  beginMessage(seconds, "seconds");

  var minutes = seconds / 60;
  minutes = parseInt(minutes);

  beginMessage(minutes, "minutes");

  var hours = minutes / 60;
  hours = parseInt(hours);

  beginMessage(hours, "hours");

  var days = hours / 24;
  days = parseInt(days);

  beginMessage(days, "days");

  var weeks = days / 7;
  weeks = parseInt(weeks);

  beginMessage(weeks, "weeks");

  if ((date === undefined || isNaN(date))) {
    document.body.innerHTML = "";
  }

  setTimeout("writeMessage('" + date + "');", 1);
}

function clearDocument() {
  document.body.innerHTML = "";
}



writeMessage("2017-07-04");

Answer 1

正如我在评论中所写:

// 'global' variable that both beginMessage and writeMessage can access
var writtenDate = null;

function beginMessage(number, timeType) {
  if (number > 0) {
  ...
  document.write(" until " + writtenDate);
  ...
} else {
  ...
}
}

function writeMessage(date) {
  // save the date sent to this function is the variable, so beginMessage can see it as well.
  writtenDate = date;
  ...
}

function clearDocument() {
  document.body.innerHTML = "";
}

writeMessage("2017-07-04");

// OR preferably: an extra parameter.

function beginMessage(number, timeType, designatedDate) {
  if (number > 0) {
  ...
  document.write(" until " + designatedDate);
  ...
} else {
  ...
}

function writeMessage(date) {
  ...
  beginMessage(milliseconds, "milliseconds", date);
  ...
  beginMessage(seconds, "seconds", date);
  ...
  beginMessage(minutes, "minutes", date);
  ...
  beginMessage(hours, "hours", date);
  ...
  beginMessage(days, "days", date);
  ...
  beginMessage(weeks, "weeks", date);
  ...
}

...

writeMessage("2017-07-04");