增加一个数字而不会消除前导零

问题描述

我从数据库中获取一个值，并将其重用为该数字具有前导零的数字，并且仅限于4位数字，表示格式为0001或0010或0100或1000例如，当我向该数字加1时，我将从零开始计数，例如以加法的方式去掉前导零

I am getting a value from database and I am reusing it as a number this number has leading zeroes and it is limited to only 4 digits meaning to say the format is 0001 or 0010 or 0100 or 1000 I am starting the count from zero when I add 1 to this number the leading zeroes are gone the way I add is for example

var databasevalue = 0000;
var incrementvalue = parseInt(databasevalue) + parseInt(1);

推荐答案

// I suppose databasevalue is a string
var databasevalue = "0125";

// coerce the previous variable as a number and add 1
var incrementvalue = (+databasevalue) + 1;

// insert leading zeroes with a negative slice
incrementvalue = ("0000" + incrementvalue).slice(-4); // -> result: "0126"

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