Use guide for setTimeout in javascript

&lt;script&gt;
/*
 //Method 1
 function slows(){
   alert("Popt out after 15S!");
 }
 setTimeout("slows()",5000);
 
 //Method 2
 function slows(){
   alert("Popt out after 15S!");
 }
 setTimeout(slows,5000);
 
 */

//Method 3function slows(){
  alert("Popt out after 15S!");
}
setTimeout(function(){slows()},5000);
 
&lt;/script&gt;

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