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How to limit a number from a cell to x decimal points?

In Google Sheets Script, how do I stop limit a number to e.g. 3 decimal points?
For instance, the following code is a section of a function I have created which will send an email of the number in cell 'Q12', however the number I receive is e.g. 1.9468186134852794% instead of 1.94%.
var changeCell = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("sheetname").getRange("Q12");
var change = changeCell.getValue();
var changeFixed = change.toFixed(3);
Thanks

function fixingDecimalPlaces() {
var ss=SpreadsheetApp.getActive();
var sh=ss.getActiveSheet();
var v=73.123456789;
sh.getRange('A1').setValue(Number(v).toFixed(3));
}

If you want to send the value in Q12 as it is shown in the sheet (with the same number of decimals), you can use getDisplayValue:
var changeCell = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("sheetname").getRange("Q12");
var change = changeCell.getDisplayValue();
This won't change the value in the spreadsheet. If you want to do that, just use setValue:
var changeCell = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("sheetname").getRange("Q12");
changeFixed = changeCell.getValue().toFixed(3);
changeCell.setValue(changeFixed);
Reference:
Range.getDisplayValue()
Range.setValue(value)

getting NaN message in javascript while adding up multiple text fields

I am developing a simple application form where I am calculating experiences from maximum three employers. Now I want to add them up . The experiences are in the form of X years Y months and Z days. I have written following javascript function --
function total(){
var td;
var fd=parseInt(document.getElementById("LoS_days1").value);
var sd=parseInt(document.getElementById("LoS_days2").value);
var ld=parseInt(document.getElementById("LoS_days3").value);
var tm;
var fm=parseInt(document.getElementById("LoS_months1").value);
var sm=parseInt(document.getElementById("LoS_months2").value);
var lm=parseInt(document.getElementById("LoS_months3").value);
var ty;
var fy=parseInt(document.getElementById("LoS_year1").value);
var sy=parseInt(document.getElementById("LoS_year2").value);
var ly=parseInt(document.getElementById("LoS_year3").value);
td = (fd +sd +ld);
var rd = td%30;
var cm = Math.floor(td/30);
document.getElementById("Totalexp_day").value=rd;
tm = (cm + fm +sm +lm);
var rm = tm%12;
var cy = Math.floor(ty/12);
document.getElementById("Totalexp_month").value=rm;
ty = (cy + fy +sy +ly);
document.getElementById("Totalexp_year").value=ty;
}
I am getting a NaN message in each of the Totalexp_day, Totalexp_month and Totalexp_day field. Earlier I had some modified code that was not showing NaN message but it was not showing the desired results. Kindly suggest what to do to eliminate these two errors.

parseInt(document.getElementById("LoS_days1").value)
if the first character of the string cannot be converted to a number, parseInt will return NaN.
To avoid this, you can so something like is suggested here:
parseInt(document.getElementById("LoS_days1").value) || 0

If document.getElementById("Totalexp_day").value is empty then also it will return NaN. Make sure you have some number there.
Second alternative is reading document.getElementById("Totalexp_day").innerHTML and then applying parseInt
Probably you alert or console log the document.getElementById("Totalexp_day").value you would be more clearer why this problem is comming

Javascript Count numbers

This probably is a very easy solution, but browsing other questions and the internet did not help me any further.
I made a javascript function which will give me a random value from the array with its according points:
function random_card(){
var rand = Math.floor(Math.random()*cards.length);
var html = "card: "+cards[rand][0]+"<br/>points: "+cards[rand][1]+"<br/><br/>";
document.getElementById("Player").innerHTML += html;
var punten = cards[rand][1];
document.getElementById("Points").innerHTML += punten;
}
I've added a += punten so i can see that it works correctly. It shows me all the point in the div with the id Points.
But what i wanted to do is count it all together so if i were to draw a 4, King and a 10 it should show 24 instead of 41010.
Thanks in advance! And if you're missing any information please let me know

Currently you are just adding strings together, which concatenate (join together) hence why you end up with 41010. You need to grab the current innerHTML (total) and use parseInt() to convert from a string to a number, then add your new cards that have been chosen, then assign this new value to the innerHTML of your element.
Try the following
function random_card(){
var rand = Math.floor(Math.random()*cards.length);
var html = "card: "+cards[rand][0]+"<br/>points: "+cards[rand][1]+"<br/><br/>";
document.getElementById("Player").innerHTML += html;
var punten = cards[rand][1];
var curPoints = parseInt(document.getElementById("Points").innerHTML, 10) || 0;
var total = curPoints + parseInt(punten, 10);
document.getElementById("Points").innerHTML = total;
}
More info on parseInt() here
EDIT
I've added this line -
var curPoints = parseInt(document.getElementById("Points").innerHTML, 10) || 0;
Which will try and convert the innerHTML of the "Points" div, but if it is empty (an empty string converts to false) then curPoints will be equal to 0. This should fix the issue of the div being blank at the start.

innerHTML is a string and JavaScript uses + for both string concatenation as numeric addition.
var pointsInHtml = parseInt(document.getElementById("Points").innerHTML, 10);
pointsInHtml += punten;
document.getElementById("Points").innerHTML = punten;
The second parameter 10 of the parseInt method is usually a good idea to keep there to avoid the function to parse it as an octal.
It might be easier to keep a points variable and only at the end put it in the #Points container, that would make the parseInt no longer necessary

innerHTML will be a string, so you need to convert it into an integer prior to adding the card value :)
function random_card(){
var rand = Math.floor(Math.random()*cards.length);
var html = "card: "+cards[rand][0]+"<br/>points: "+cards[rand][1]+"<br/><br/>";
document.getElementById("Player").innerHTML += html;
var punten = cards[rand][1],
curPunten = parseInt(document.getElementById('Points').innerHTML);
document.getElementById("Points").innerHTML = curPunten + punten;
}

2 text box need to verify they are not empty or contain 0

I have a function with info that grabs hours, rates, and then tax deduction and then spits it out. It works fine
var newtax= new Number(dep[i]);
taxrate = newtax*100;
var h=eval(document.paycheck.hours.value);
var r=eval(document.paycheck.payrate.value);
document.paycheck.feedback.value= taxrate + txt;
var total= r*(1-newtax)*h ;
total=total.toFixed(2);
document.paycheck.feedback3.value= ("$ "+ total);
I have to put where it takes the total and puts it in a function to put it only two decimals. It works this way and only does two decimals but i need the decimal conversion in a function. can anyone shed some like .
This is where i cut it to two decimals and i am unable to put in function and then send it back to the feedback3.value.
total=total.toFixed(2);
document.paycheck.feedback3.value= ("$ "+ total);

If you're asking how to write a function that takes a number and formats it as a dollar value with two decimals (as a string) then this would work:
function formatMoney(num) {
return "$ " + num.toFixed(2);
}
// which you could use like this:
document.paycheck.feedback3.value= formatMoney(total);
// though you don't need the total variable (unless you use it elsewhere)
// because the following will also work:
document.paycheck.feedback3.value = formatMoney( r*(1-newtax)*h );
By the way, you don't need eval to get the values from your fields. Just say:
var h = document.paycheck.hours.value;
var r = document.paycheck.payrate.value;

Parse HTML source for dollar amounts then set highest amount as var

I need a JavaScript function that will parse the HTML source of the page from which it is called as an external script, retrieve any dollar amounts in the source, and set the highest dollar amount to a JavaScript variable.
So for instance, if the page contains the text, "Your product is $40.32 and tax is $4.50, your total is $44.82.", the JS should parse those values and set $44.82 to "var total" as the highest amount. Possible?

Thanks based on the tips I wrote this, which works. Hopefully yours or my solution will help others:
var dochtml = document.getElementsByTagName('body')[0].innerHTML;
dochtml = dochtml.replace(/(\r\n|\n|\r)/gm,"");
var price_array = new Array;
var pattmatch = /(\$(([0-9]{0,1})?.[0-9]{1,2}))|(\$([1-9]{1}[0-9]{0,2}([,][0-9]{3})*)(.[0-9]{1,2})?)/gi;
price_array = dochtml.match(pattmatch);
if (price_array) {
for (var i=0; itotal || !total) {
var total=price_array[i];
}
}
document.write(total);
}

You can grab the HTML of the current document from the Javascript by grabbing the document's innerHtml, something like:
document.getElementsByTagName('html')[0].innerHTML
Then you can pull out all the currency values with a regular expression, something like:
((\$(([0-9]{0,1})?\.[0-9]{1,2}))|(\$([1-9]{1}[0-9]{0,2}([,][0-9]{3})*)(\.[0-9]{1,2})?))
Just loop through all the matches and every time the current match is greater than the value in total, set total to the current match.
Disclaimer: That regex was pulled from the community on http://gskinner.com/RegExr/ and I can't promise you it's 100% fullproof.

Take a look at this question here, which demonstrates how to extract numbers from a String: Javascript extracting number from string
Try this:
// get all content from page
var content = document.body.innerHTML;
// create an array of all dollar amounts in the content
arrayNum = content.match(/\$[0-9]+\.[0-9]+/g);
// display array of numbers
console.info(arrayNum);
var high = 0;
for(var i = 0; i < arrayNum.length; i++) {
// remove the dollar sign and cast the string to a float
arrayNum[i] = parseFloat(arrayNum[i].substring(1));
// get the high value - O(n) operation
high = ( (arrayNum[i]) > high ) ? arrayNum[i] : high;
}
alert("High value = " high);