JavaScript retrieves the decimal places of any float type

Use Javascript to get the first two digits of the float decimal point. For example, 22.127456 is used to get 22.13. How can this problem be solved?

1. This method is not recommended at all:

Function get () {var s = 22.127456 + ""; var str = s. substring (0, s. indexOf (".") + 3); alert (str );}

2. Use a regular expression to obtain:

Function get () {var a = "23.456322"; var aNew; var re =/([0-9] + \. [0-9] {2}) [0-9] */; aNew =. replace (re, "$1"); alert (aNew );}

3. relatively advanced applications:

Function get () {var num = 22.127456; alert (Math. round (num * 100)/100 );}

4. The simplest and most convenient:

Function get () {var num = new Number (13.37); num = num. toFixed (2); // 2 is the number of digits after the decimal point is obtained. It is automatically rounded to alert (num );}