Five implementation methods for removing spaces before and after strings in js and comparison _ javascript skills

If you enter spaces during registration, how can we remove them? Next, let's share with you the frequently used JavaScript code. For more information, see, we hope this will help you to remove spaces when users enter spaces during project registration?
Below is my frequently used js to share with you:

First: Replacement of cyclic check
[Javascript]

The Code is as follows:

// For the user to call
Function trim (s ){
Return trimRight (trimLeft (s ));
}
// Remove the left blank
Function trimLeft (s ){
If (s = null ){
Return "";
}
Var whitespace = new String ("\ t \ n \ r ");
Var str = new String (s );
If (whitespace. indexOf (str. charAt (0 ))! =-1 ){
Var j = 0, I = str. length;
While (j <I & whitespace. indexOf (str. charAt (j ))! =-1 ){
J ++;
}
Str = str. substring (j, I );
}
Return str;
}
// Remove the blank www.jb51.net on the right.
Function trimRight (s ){
If (s = null) return "";
Var whitespace = new String ("\ t \ n \ r ");
Var str = new String (s );
If (whitespace. indexOf (str. charAt (str. length-1 ))! =-1 ){
Var I = str. length-1;
While (I> = 0 & whitespace. indexOf (str. charAt (I ))! =-1 ){
I --;
}
Str = str. substring (0, I + 1 );
}
Return str;
}

Type 2: Regular Expression replacement
[Javascript]

The Code is as follows: