Round values to one decimal place in javascript

Question

How to change the decimal value to one digit in javascript.For eg. I have value 5 and I need to show 5.0 in my javascript function .

Answer 1

Check this Demo jsFiddle

Use toFixed() Javascript function

JavaScript

var num = 5;
var n = num.toFixed(1);
console.log(n);

Console Output

5.0

toFixed() Function References

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Updated Answer

Above answer return string but OP's require float value, use parseFloat() function,

Javascript

var num = 5;
var n = parseFloat(num).toFixed(1);
console.log(n);

Answer 2

Number.prototype.toFixed()

Returns

A string representation of number that does not use exponential notation and has exactly digits digits after the decimal place. The number is rounded if necessary, and the fractional part is padded with zeros if necessary so that it has the specified length. If number is greater than 1e+21, this method simply calls Number.prototype.toString() and returns a string in exponential notation.

Examples

var numObj = 12345.6789; 
numObj.toFixed();         // Returns "12346": note rounding, no fractional part  
numObj.toFixed(1);        // Returns "12345.7": note rounding  
numObj.toFixed(6);        // Returns "12345.678900": note added zeros
(1.23e+20).toFixed(2);    // Returns "123000000000000000000.00"
(1.23e-10).toFixed(2);    // Returns "0.00"
2.34.toFixed(1);          // Returns "2.3"
-2.34.toFixed(1);         // Returns -2.3 (due to operator precedence, negative number literals don't return a string...)
(-2.34).toFixed(1);       // Returns "-2.3" (...unless you use parentheses)