How to make it smaller in javascript

In JavaScript, there are many methods to change the size of numbers. These methods are introduced one by one below:

1. Math.floor()
   Math.floor() function returns less than or equal to The largest integer for a given number.

For example:

Math.floor(1.7); // Returns 1
Math.floor(-1.7); // Returns -2

2. Math.ceil()
   Math.ceil() function returns the smallest integer greater than or equal to a given number.

For example:

Math.ceil(1.7); // Return 2
Math.ceil(-1.7); // Return -1

3. Math.round()
   Math.round() function returns a number rounded to the nearest integer.

For example:

Math.round(1.7); // Returns 2
Math.round(-1.7); // Returns -2

4. toFixed()
   toFixed() method can preserve the number of decimal places in a number.

For example:

var num = 7.123456;
console.log(num.toFixed(2)); // Output 7.12

5. parseFloat()
   parseFloat() method can extract a floating point number from a string.

For example:

var str = "3.14";
console.log(parseFloat(str)); // Output 3.14

In actual development , we usually use multiple combinations of these methods. For example, we may need to round a floating point number to two decimal places before rounding it. We can write it like this:

var num = 1.23456;
var newNum = Math.round(num.toFixed(2));
console.log(newNum); // Output 1.23

In short, JavaScript provides a variety of methods to change the size of numbers, and developers can choose the appropriate method according to actual needs.

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