复杂数学计算中的舍入小数

Question

I have a variable I've been working on which I can't seem to output the way I would like it to. Here is the variable I currently have:

var resource1RatePerHour = Math.ceil(resource1BaseRate1 * Math.pow(resourceIncomeModifier, resource1BuildingLevel) +30) / 3600;

Now this is called on a increment timer every second, though has to be calculated as a per hourly gain (hence the division by 3600).

This all seems to work however my issue is that there are now many trailing digits which I would like removed, preferably not using a trim method. Before (using Math.ceil) I wouldn't get any decimals. If I add the "/ 3600" within the Math.ceil equation the whole calculation will not work, so it has to stay outside both Math.ceil and Math.pow.

Answer 1

If you just want to display it in a nice format, converting to a string will remove them I think.

var x = 1.245000
var niceDisplay = x.toString() // "1.245" 

Answer 2

You can use JavaScript toFixed() function:

 var x = 123.45 * 234.56; document.body.innerHTML += x.toFixed(0) + "<br/>"; document.body.innerHTML += x.toFixed(1) + "<br/>"; document.body.innerHTML += x.toFixed(2) + "<br/>"; document.body.innerHTML += x.toFixed(3) + "<br/>"; document.body.innerHTML += x.toFixed(4) + "<br/>"; document.body.innerHTML += x.toFixed(5) + "<br/>";