JavaScript Math.sqrt() Method

　JavaScript Math Object

Math.sqrt()The method returns the square root of a number.

If the passed parameter is negative, Math.sqrt() returns NaN.

Because sqrt() is a static method of Math, you should always use it asMath.sqrt(), rather than using it as a method of the created Math object.

Syntax:

Math.sqrt(x)

Math.sqrt(9);　　　//　3
Math.sqrt(64);　　//　8
Math.sqrt(2);　　　//　1.414213562373095
Math.sqrt(1);　　　//　1
Math.sqrt(0);　　　//　0
Math.sqrt(-1);　　//　NaN

Browser Compatibility

All browsers fully support the Math.sqrt() method:

Parameter Value

Technical Details

　JavaScript Math Object