PHP's Dot Equals `.=` operator in Javascript?

How can you use PHP's Dot Equals .= operator in开发者_运维知识库 Javascript?

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What you are mentioning is a contatenation equals operator which sets the value of the left hand operand to a string containing a concatenation of its value appended with the string in the right hand operand.

You can do the same operation in javascript using the += operator.

var str = "test";

str += " appended string";

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I assume that the .= operator is used for string concatenation?

In Javascript the + operator is used for string concatenation, and the += operator for reassigning the string to the same variable. Example:

s += ',';

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use += eg:

a = 'Hello'
a += 'World'

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 var a = "";
 a += "fff";