Javascript output, alert, console.log, innerHTML

About JavaScript Output

JavaScript does not have built-in functions for display, but we are able to display data in different ways:

• into an alert box, using alert() method which displays an alert box with a specified message;

  var a = 5;
  var b = 6;
  if (a < b){
    window.alert("a is less then b");
  }
  

   

• into the browser console, using console.log(). You may pass as many arguments as you’d like;

  var a = 5;
  var b = 6;
  if (a < b){
    console.debug("a is less then b");
    //or
    console.log (a,b);
  }
  

   

• into an HTML element, using innerHTML property which sets or returns the HTML content of an element;

  var a = 5;
  var b = 6;
  if (a < b){
    document.getElementById("whereToAdd").innerHTML("a is less then b");
  }
  

   

• into the HTML output using document.write() method.
  If is used after an HTML document is fully loaded, it will delete all existing HTML;

  var a = 5;
  var b = 6;
  if (a < b){
    document.write("a is less then b");
  }
  

   

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