adding numbers from array?

Question

i have:

var str="100px";
var number = str.split("px");
number = number[0];

var km = "100px";
var numberk = km.split("px");
numberk = numberk[0];

var gim = numberk+100;
var kim = number+100;
var fim = number+numberk;
document.write(gim+'<br>'+kim+'<br>'+jim+'<br>');

i would be thankfull if someone could me answere why the result are added like string rather than nummerical number in javascript i have used the isNaN(); function which shows this as a legal number. So how can this problem be solved.

thanks.

Answer 1

You could use the parseInt function in order to convert the string returned when spliting into integer:

number = parseInt(number[0], 10);
numberk = parseInt(numberk[0], 10);

Now the 2 variables are integers and you could perform integer operations on them.

Answer 2

You need to put parseInt() around each number before you use it. In fact, you could do this without removing the "px".

 gim = parseInt(km) + 100;

Answer 3

simplest way to do this, you don't need to use split .

var str="150px";
var str1 = (parseInt(str)+100)+"px";
alert(str1);

OUTPUT:

200px

fiddle : http://jsfiddle.net/Kk3HK/1/

Answer 4

将数字包装在parseInt() 。

Answer 5

use parseInt()

var number = parseInt(str, 10);
var numberk = parseInt(km, 10);

Answer 6

Use parseInt to convert the string to a number.

var str = "100px";
var number = parseInt(str, 10);

parseInt stops when it finds the first non-number character, so you don't even need to remove the "px" .