Javascript rounding result of splitting

Question

I perform the following operation in Javascript:

0.0030 / 0.031

How can I round a result to an arbitrary number of places? What is the maximum number?

Answer 1

Modern browsers must support a method called toFixed(). Here is an example taken from the Internet :

// Example: toFixed(2) when the number has no decimal places
// It will add trailing zeros
var num = 10;
var result = num.toFixed(2); // result will equal 10.00

// Example: toFixed(3) when the number has decimal places
// It will round to the thousandths place
num = 930.9805;
result = num.toFixed(3); // result will equal 930.981

toPrecision() may also be useful to you, there is another great example on this page.

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For older browsers, you can execute it manually using Math.round. Math.round()rounded to the nearest integer. To achieve decimal precision, you need to manipulate your numbers a bit:

• 10 ^ x (10 x), x .
  • Math.round()
  • 10 ^ x

, 5.11111111 , :

var result=Math.round(5.111111*1000)/1000  //returns 5.111

Answer 2

1.7976931348623157 * 10 ³⁰⁸. ECMAScript-262 3- . Number.MAX_VALUE, .

Answer 3

Jag:

• toFixed(). ; , .
• , , . , , . - 1/3, , .