javascript - JQuery/JavaScript 增量编号

Question

我试图每秒增加一个给定值并使用 JavaScript 或 JQuery 保留格式

我正在努力做到这一点。

假设我有一个这样的数字：

1412015

每秒可以递增的数字是可变的，它可以是 0.1 和 2 之间的任何值。

是否有可能，如果它必须以每秒递增的值是 0.54 来增加数字并具有以下输出：

1,412,016
1,412,017
1,412,018

谢谢

伊夫

Answer 1

我不太确定我了解您的增量案例以及您想要展示的内容。但是，我决定提出一个格式化数字的解决方案。

我有两个版本的数字格式例程，一个解析数组，一个用正则表达式格式化。我承认它们不是最容易阅读的，但我很高兴想出这种方法。

如果你好奇的话，我试着用评论来描述这些线条

数组解析版本：

function formatNum(num) {
    //Convert a formatted number to a normal number and split off any 
    //decimal places if they exist
    var parts = String( num ).replace(/[^\d.]-/g,'').split('.');
    //turn the string into a character array and reverse
    var arr = parts[0].split('').reverse();

    //initialize the return value
    var str = '';

    //As long as the array still has data to process (arr.length is 
    //anything but 0)
    //Use a for loop so that it keeps count of the characters for me
    for( var i = 0; arr.length; i++ ) {
        //every 4th character that isn't a minus sign add a comma before 
        //we add the character
        if( i && i%3 == 0 && arr[0] != '-' ) {
            str  = ',' + str ;
        }

        //add the character to the result
        str  = arr.shift() + str ;
    }

    //return the final result appending the previously split decimal place 
    //if necessary
    return str + ( parts[1] ? '.'+parts[1] : '' );
}

正则表达式版本：

function formatNum(num) {
    //Turn a formatted number into a normal number and separate the 
    //decimal places
    var parts = String( num ).replace(/[^\d.]-/g,'').split('.');
    //reverse the string
    var str = parts[0].split('').reverse().join('');
    //initialize the return value
    var retVal = '';

    //This gets complicated. As long as the previous result of the regular 
    //expression replace is NOT the same as the current replacement, 
    //keep replacing and adding commas.
    while( retVal != (str = str.replace(/(\d{3})(\d{1,3})/,'$1,$2')) ) {
        retVal = str;
    }

    //If there were decimal points return them back with the reversed string
    if( parts[1] ) {
        return retVal.split('').reverse().join('') + '.' + parts[1];
    }

    //return the reversed string
    return retVal.split('').reverse().join('');
}

假设您想每秒输出一个以 0.54 为增量的格式化数字，您可以使用间隔来进行增量和输出。

仅带有 Firebug 的超短 Firefox 示例：

var num = 1412015;

setInterval(function(){
    //Your 0.54 value... why? I don't know... but I'll run with it.
    num += 0.54;
    console.log( formatNum( num ) );
},1000);

你可以在这里看到这一切：http: //jsbin.com/opoze

Answer 2

要每秒增加一个值，请使用以下结构：

var number = 0; // put your initial value here

function incrementNumber () {
    number += 1; // you can increment by anything you like here
}

// this will run incrementNumber() every second (interval is in ms)
setInterval(incrementNumber, 1000); 

这将为您格式化数字：

function formatNumber(num) {
   num = String(num);

   if (num.length <= 3) {
      return num;
   } else {
      var last3nums = num.substring(num.length - 3, num.length);
      var remindingPart = num.substring(0, num.length - 3);
      return formatNumber(remindingPart) + ',' + last3nums;
   }
}

Answer 3

function rounded_inc(x, n) {
  return x + Math.ceil(n);
}

var x = 1412015;
x = rounded_inc(x, 0.54);