how to round to the nearest integer in javascript code example

Example 1: round to nearest hundredth javascript

Math.round(X);           // round X to an integer
Math.round(10*X)/10;     // round X to tenths
Math.round(100*X)/100;   // round X to hundredths
Math.round(1000*X)/1000; // round X to thousandths

Example 2: round to nearest decimal javascript

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