I have an issue with the variables + They both result me 310. But they both have to result me 13 because var1 = 3 and var2 = 10.
var var1 = document.getElementById("start").value;
var var2 = 10;
var3 = var1 + var2;
alert(var3);
And Its Html:
<input type="text" id="start" value="3" />
just use parseInt() for the value you get from textbox
var var1 = document.getElementById("start").value;
var var2 = 10;
var3 = parseInt(var1) + var2;
alert(var3);
They have become strings. Convert to number
var var3 = Number(var1) + Number(var2);
your trying to add two strings together. use the following to change them to numbers.
var var3 = +var1 + +var2
The main problem is this part,
document.getElementById("start").value
becaus it returns a string, as all input values are strings in HTML.
For using this value as a number, you could use various methods to convert a string to a number, like
parseInt(string, base), result is a integer numberparseFloat(string), result is a floating numberNumber(string), using the number object+string, implicit casting to number with an unary plus symbol.string1 - string2 yields to number - number.