Summary of multiple methods to delete string spaces in javascript_javascript skills

Copy code The code is as follows:

// Remove the leading space (left space) from the string
function LTrim(str){
var i;
for(i=0;iif(str.charAt(i)!=" ") break ;
}
str = str.substring(i,str.length);
return str;
}
// Remove the trailing space (right space) of the string
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 leading and trailing spaces (left and right spaces) of the string
function Trim(str){
return LTrim(RTrim(str));
}

Delete all functions in the string
js delete string spaces function

Copy code The code is as follows:

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 methods do not use regular expressions. Let’s try using regular expressions.
Replace spaces with regular expressions

Copy code The code is as follows:

//Remove spaces in the middle of the string
String.prototype.Trim = function( ) {
return this.replace(/(^s*)|(s*$)/g, "");
}
//Remove spaces on the left side of the string
String.prototype .LTrim = function() {
return this.replace(/(^s*)/g, "");
}
//Remove spaces on the right side of the string
String.prototype. RTrim = function() {
return this.replace(/(s*$)/g, "");
}

Remove all spaces

Copy code The code is as follows:

var s = "asd ddd bbb sss";
var reg = /s/ g;
var ss = s.replace(reg, "");
alert(ss);

Remove all spaces in the string (including middle spaces, you need to set the second The parameters are: g)

Copy code The code is as follows:

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;
}