JS several ways to remove the word string around the space, please see

Recon's ideas:
//-------------
Remove the space on the left side of the string
function LTrim (str)
{
if (Str.charat (0) = = "")
{
If the first character on the left of the string is a space
str = str.slice (1);//Remove the space from the string
This sentence can also be changed to str = str.substring (1, str.length);
str = LTrim (str); Recursive call
}
return str;
}
Remove the space on the right side of the string
function RTrim (str)
{
var ilength;

Ilength = Str.length;
if (Str.charat (iLength-1) = "")
{
If the first character to the right of the string is a space
str = str.slice (0, iLength-1);//Remove spaces from string
This sentence can also be changed to str = str.substring (0, iLength-1);
str = RTrim (str); Recursive call
}
return str;
}
Remove the spaces on either side of the string
function Trim (str)
{
Return LTrim (RTrim (str));
}
Rainy Day 5337 of ideas:
//----------------
function Alltrim (a_strvarcontent)
{
var pos1, Pos2, newstring;

POS1 = 0;
Pos2 = 0;
NewString = ""

if (A_strvarcontent.length > 0)
{
for (i=0; i<=a_strvarcontent.length; i++)
Recon: This sentence should be wrong, should be changed to: