JavaScript Remove string spaces multiple methods summary

The code is as follows

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Remove the header space of the string (left space) function LTrim (str) { var i; for (i=0;i<str.length; i++) { if (Str.charat (i)!= "") break; } str = str.substring (i,str.length); return str; } Remove the trailing space of the string (right space) function RTrim (str) { var i; for (i=str.length-1;i>=0;i--) { if (Str.charat (i)!= "") break; } str = str.substring (0,i+1); return str; } Remove the trailing space of the string (left and right) function Trim (str) { Return LTrim (RTrim (str)); }

Delete all functions in a string

JS Delete string space function

The code is as follows

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function Jtrim (str) { var i = 0; var len = str.length; if (str = = "") return (str); j = len-1; Flagbegin = true; Flagend = true; while ((Flagbegin = = True) && (i< len) { if (Str.charat (i) = = "") { i=i+1; Flagbegin=true; } Else { Flagbegin=false; } } while ((flagend== true) && (j>=0) { if (Str.charat (j) = "") { J=j-1; Flagend=true; } Else { Flagend=false; } } if (i > J) return (""); Trimstr = str.substring (i,j+1); return trimstr; }

The above method is useless to the regular, we use the regular expression to try

Regular substitution space

The code is as follows	Copy Code
Remove middle space in string String.prototype.Trim = function () { Return This.replace (/(^s*) | ( s*$)/g, ""); } Remove space on left side of string String.prototype.LTrim = function () { Return This.replace (/(^s*)/g, ""); } Remove the right space on the string String.prototype.RTrim = function () { Return This.replace (/(s*$)/g, ""); }

Remove all spaces

The code is as follows	Copy Code
var s = "ASD ddd bbb SSS"; var reg =/s/g; var ss = S.replace (Reg, ""); Alert (ss);

Remove all spaces in the string (including intermediate spaces, and set the 2nd argument to: G)

code is as follows	copy code
function Trim ( Str,is_global)  {          var result;          result = str.replace (/(^s+) | ( s+$)/g, "");          if (is_global.tolowercase () = = "G")              result = Result.replace (/s/g, "");          return result; }