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Math.round(X); // round X to an integer
Math.round(10*X)/10; // round X to tenths
Math.round(100*X)/100; // round X to hundredths
Math.round(1000*X)/1000; // round X to thousandths
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Math.round(3.14159 * 100) / 100 // 3.14
3.14159.toFixed(2); // 3.14 returns a string
parseFloat(3.14159.toFixed(2)); // 3.14 returns a number
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Math.round(X); // round X to an integer
Math.round(10*X)/10; // round X to tenths
Math.round(100*X)/100; // round X to hundredths
Math.round(1000*X)/1000; // round X to thousandths
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round(12345.6789, 2) // 12345.68
round(12345.6789, 1) // 12345.7
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function round(value, precision) {
var multiplier = Math.pow(10, precision || 0);
return Math.round(value * multiplier) / multiplier;
}
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// Simplest way
function roundHalf(num) {
return Math.round(num*2)/2;
}