The basic method of string concatenation in JavaScript

Very simply, use 1 "+" to "add" two strings:

   var longString = "One piece " + "plus one more piece."; 

To accumulate multiple strings into a single string, you can also use the "+=" operator:

   var result = "";


   result += "My name is Anders"


   result += " and my age is 25"; 

To add a newline character to a string, you need to use the escape character "" :

   var confirmString = "You did not enter a response to the last " +
    "question.Submit form anyway?";


   var confirmValue = confirm(confirmString);

However, this method can only be used in situations such as warning, confirmation dialog, etc. If the text is rendered as HTML content, it will be invalid. < br > "Instead of it:

   var htmlString = "First line of string.<br>Second line of string.";


   document.write(htmlString);

The String object also provides the method concat(), which does the same thing as "+" :

   string.concat(value1, value2, ...)

But the concat() method is certainly not as straightforward as the + method.