Numbers in the form of 001

问题

Is there a special name for numbers in the format of 001. For example the number 20 would be 020 and 1 would be 001.
Its hard to Google around when you don`t know somethings name!
Since I am already wasting your guys time does any one know a function for changing numbers to this format.

回答1:

I think this is usually called "padding" the number.

回答2:

Its called left zero padded numbers.

回答3:

It's called padding.

回答4:

Well, if you're talking about that notation within the context of certain programming languages, 020 as opposed to 20 would be Octal rather than Decimal.

Otherwise, you're referring to padding.

回答5:

A quick google search revealed this nice snippet of code for Number Padding: http://sujithcjose.blogspot.com/2007/10/zero-padding-in-java-script-to-add.html

function zeroPad(num,count)
{
  var numZeropad = num + '';
  while(numZeropad.length < count) {
    numZeropad = "0" + numZeropad;
  }
  return numZeropad;
}

回答6:

You can use a simple function like:

function addZ(n) {
  return (n<10? '00' : n<100? '0' : '') + n;
}

Or a more robust function that pads the left hand side with as many of whatever character you like, e.g.

function padLeft(n, c, len) {
  var x = ('' + n).length;
  x = (x < ++len)? new Array(len - x) : [];
  return  x.join(c) + n
}

回答7:

Try this one:

Number.prototype.toMinLengthString = function (n) {
    var isNegative = this < 0;
    var number = isNegative ? -1 * this : this;
    for (var i = number.toString().length; i < n; i++) {
        number = '0' + number;
    }
    return (isNegative ? '-' : '') + number;
}

来源：https://stackoverflow.com/questions/6823592/numbers-in-the-form-of-001

标签

javascript

number-formatting