How to change a negative number to positive?

How to make a negative number to be positive (ie. -25 to be 25) in JavaScri开发者_开发问答pt?

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There are various ways:

var m, n = -25;
m = -1 * n;
m = -n;
m = Math.abs(n);

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var n= -25;
var m= -1 * n;

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use Math.abs function