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javascript format (round) number:

var n = 12345.6789;
n.toFixed(); // 12346
n.toFixed(1); // 12345.7
n.toFixed(6); // 12345.678900
(1.23e+20).toFixed(2); // 123000000000000000000.00
(1.23e-10).toFixed(2); // 0.00