An example to use trim method

JavaScript / HTML/ CSS Code

Output

<!DOCTYPE html>
<html>
<head>

<style>
.divcls
{
  background: #D9534F;
  width:310px;
  border-radius: 15px;
  padding:20px;
  font-size:16px;
  color:#fff;   
}
span {
    background: #5AB65A;
}
.btncls{
    background-color:#4F6677;
    border: #2e6da4;
  	font-family: Arial, Geneva, Arial, Helvetica,  sans-serif;
	font-size: 15px;
    color: #FFFFFF;
    letter-spacing: 1px;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: normal;

    border-radius: 4px;
    line-height: 1.5;
    text-decoration:none;
} 
</style>
</head>

<body>
<div class="divcls">
<p>The string before trim: <span>"       Trim Tutorial     "</span></p>
<p>Retruned string after trim: <span id="strtrimmed"></span></p>

</div>
<p></p><button class="btncls" onclick="trimstring()">Execute trim method</button></p>

<script type="text/javascript">
function trimstring(){
var str = "       Trim Tutorial     ";
var str_trim = str.trim();

document.getElementById("strtrimmed").innerHTML = str_trim;

}
</script>

</body>
</html>

The string before trim: " Trim Tutorial "

Retruned string after trim: