This part describes common methods of the Math object
1.Math.abs (value), the value is converted to absolute values. such as:
console.log(Math.abs(-567));
Print the return value is 567
2.Math.ceil (value), the values are rounded up. such as:
console.log(Math.ceil(5.666));
Print the return value of 6
3.Math.floor (value), the value is rounded down. such as:
console.log(Math.ceil(5.666));
Print return value 5
4.Math.random (), randomly generated within a decimal range of 0-1. such as:
console.log(Math.random());
Returns the print range is a random decimal 0-1, such 0.6973378142792437
5.Math.round (value), the value is rounded to the nearest integer. such as:
console.log(Math.round(5.666));
Print the return value of 6