Question

How to use the += assignment operator in JavaScript

Answer 1

<script>
var x = 3;
x += 7;
document.write("x = " + x + "<br />");

var y = 2;
y += x;
document.write("y = " + y + "<br />");

/*
run:

x = 10
y = 12

*/
</script>

 

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