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Flash Player 4.
expression1+=expression2
expression1,expression2 A number or string.
Nothing.
Operator (arithmetic compound assignment); assigns expression1 the value of expression1 + expression2. For example, the following two statements have the same result:
x += y;x = x + y;
This operator also performs string concatenation. All the rules of the addition operator (+) apply to the addition assignment (+=) operator.
The following example shows a numeric use of the += operator.
x = 5;
y = 10;
x += y;
trace(x);
//x returns 15
This example uses the += operator with a string expression and sends "My name is Gilbert" to the Output panel.
x = "My name is " x += "Gilbert" trace (x) // returns "My name is Gilbert"
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