javascript show only one decimal place code example

Example 1: math.round js 1 decimal

var number = 12.3456789;
var rounded = Math.round( number * 10 ) / 10;
// rounded is 12.3

Example 2: round to nearest decimal javascript

round(12345.6789, -1) // 12350
round(12345.6789, -2) // 12300