Five ways Javascript removes whitespace before and after a string

First: cyclic check replacement
[JavaScript]

 function  return

Remove the left blank

functionTrimleft (s) {if(s = =NULL) { return""; } varwhitespace =NewString ("\t\n\r"); varstr =NewString (s);if(Whitespace.indexof (Str.charat (0))! =-1) { varj=0, i =str.length; while(J < i && Whitespace.indexof (Str.charat (j))! =-1) {J++; } STR=Str.substring (J, i);} returnstr;} 

Remove the blank on the right

functionTrimRight (s) {if(s = =NULL)return""; varwhitespace =NewString ("\t\n\r"); varstr =NewString (s);if(Whitespace.indexof (Str.charat (str.length-1))! =-1){ vari = Str.length-1;  while(I >= 0 && whitespace.indexof (str.charat (i))! =-1) {i--; } STR= str.substring (0, i+1); } returnstr;} 

The second type: regular replacement
[JavaScript]

 <script language= "JavaScript" > <!-- String.prototype.Trim  = Span style= "color: #0000ff;" >function   () { return  this . Replace (/(^\s*) | ( \s*$)/g, ");} String.prototype.LTrim  = function   () {  return  this . Replace (/(^\s*)/g, ");} String.prototype.RTrim  = function   () {  return  this . Replace (/(\s*$)/g, ""  // -->  </SCRIPT> 

The third type: using jquery

[JavaScript]

$.trim (str) jquery internal implementation is: [JavaScript] function  return str.replace (/^ (\s|\u00a0) +/, "). Replace (/(\S|\U00A0) +$/, '

Fourth: Use of Motools

[JavaScript]

functionreturn str.replace (/^ (\s|\xa0) +| ( \S|\XA0) +$/g, "

Fifth: Clipping string mode
[JavaScript]

function= str.replace (/^ (\s|\u00a0) +/, 'for (var i=str.length-1; i>=0; i--if(/\s/= str.substring (0, i+1breakreturn str;}

Five ways Javascript removes whitespace before and after a string