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2.9.2 digital type processing and convenient methods of ext JS

2022-07-19 03:36:00 【oscar999】

stay Ext JS How to operate the number type is the correct posture in the application of ？

Ext JS No doubt support JS Native number types Number, At the same time, it also provides a simple and convenient operation of numeric variables .

JavaScript Of Number type

  • Use new number Definition 
var s = '10';
var n  =  Number(s);
  • If it cannot be converted to numbers , Then return to NaN
s = '10d';
n  = Number(s); //NaN

Use Number Object's property assignment 

biggestNum = Number.MAX_VALUE;
smallestNum = Number.MIN_VALUE;
infiniteNum = Number.POSITIVE_INFINITY;
negInfiniteNum = Number.NEGATIVE_INFINITY;
notANum = Number.NaN;

Convert a date object to a number 

var d = new Date("December 30, 2022 08:08:00");
console.log(Number(d)); //1672358880000

The main method

  • toFixed ( digits ) , Number of decimal places 
var n = 100;
console.log(n.toFixed(2)); //100.00
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