Basic knowledge of string concatenation in JavaScript

Very simply, "add" two strings with a "+":

   var longstring = "One Piece" + "plus one more piece."; 

To accumulate more than one string as a string, you can also use the "+ =" Operator:

   var result = "";


   result = "My name was Anders" result + = "and I Age is


   25"; 

To add a line break in a string, you need to use the escape character "":

   var confirmstring = "You did don't enter a response to the" "+
    " question. Submit form anyway? ";


   var confirmvalue = confirm (confirmstring);

However, this method can only be used in cases such as warning, confirmation dialog box, if this text is rendered as HTML content, it is invalid, and then replace it with "<br>":

   var htmlstring = "A. String.<br>second line of String.";


   document.write (htmlstring);

The string object also provides a method concat () that completes the same function as "+":

   String.Concat (value1, value2, ...)

But Concat () method is obviously not as "+" come intuitive simplicity.