Retrieve Sharepoint UserName in Content Editor Web part

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Javascript

SharePoint2010

I was trying to display Sharepoint-User name on Pageload in a content editor-webpart using Javascript;

Now the following code is working because there is an alert("ppp"); function within the code.

If I remove this line It will not displaying the username.
Instead of alert I have tried with timeout function to wait for a while.
But that is also not working. Can you find the reason?. Or Is there any other way to achieve this?

Just copy and past the below code to a content-editor webpart for your testing.

<script type="text/javascript">

 _spBodyOnLoadFunctionNames.push("CallClientOM()");
        
function CallClientOM() {

document.getElementById("DivRequestorName").innerHTML="";
alert("ppp");
            var context = new SP.ClientContext.get_current();
            this.website = context.get_web();
            this.currentUser = website.get_currentUser();
            context.load(currentUser);
            context.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
        }

        function onQuerySucceeded(sender, args) {
document.getElementById("DivRequestorName").innerHTML =" ";
            document.getElementById("DivRequestorName").innerHTML = currentUser.get_loginName();
        }

        function onQueryFailed(sender, args) {        
           
            document.getElementById("DivRequestorName").innerHTML = " ";
        };

</script>

<div id="DivRequestorName"></div>