How JavaScript customizes the Trim method _javascript tips

Compared to Vbscript,javascript is already very powerful in string processing, but there is no need to remove the space before and after the trim method.

Clear the right and left spaces
function trim (s) {return 
 trimright trimleft (s)); 
} 
 
Clear the left Space
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; 
} 
 
Clear the right space 
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; 
}

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