'toFixed' Math function to format number

var my_val=11.257;
document.write (my_val.toFixed(2)); // output 11.26
document.write ("----");

var my_val=11.25;
document.write (my_val.toFixed(1)); // output 11.3
document.write ("----");

var my_val=11.978;
document.write (my_val.toFixed(4)); // output 11.9780
document.write ("----");