From 074785cea106179cb3305637055ab0a009ca74f2 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:42:52 -0500 Subject: initial commit --- .../reference/global_objects/math/floor/index.html | 199 +++++++++++++++++++++ 1 file changed, 199 insertions(+) create mode 100644 files/pt-br/web/javascript/reference/global_objects/math/floor/index.html (limited to 'files/pt-br/web/javascript/reference/global_objects/math/floor') diff --git a/files/pt-br/web/javascript/reference/global_objects/math/floor/index.html b/files/pt-br/web/javascript/reference/global_objects/math/floor/index.html new file mode 100644 index 0000000000..13dc5a0638 --- /dev/null +++ b/files/pt-br/web/javascript/reference/global_objects/math/floor/index.html @@ -0,0 +1,199 @@ +--- +title: Math.floor() +slug: Web/JavaScript/Reference/Global_Objects/Math/floor +tags: + - JavaScript + - Math + - Method +translation_of: Web/JavaScript/Reference/Global_Objects/Math/floor +--- +
{{JSRef("Global_Objects", "Math")}}
+ +

Resumo

+ +

A função Math.floor(x) retorna o menor número inteiro dentre o número "x".

+ +

Sintaxe

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Math.floor(x)
+ +

Parâmetros

+ +
+
x
+
Um número.
+
+ +

Descrição

+ +

Por floor ser um método estático de Math, você sempre irá usar como Math.floor(),e não como método do objeto Math que você criou.

+ +

Exemplos

+ +

Exemplo: Usando Math.floor

+ +
Math.floor( 45.95); //  45
+Math.floor(-45.95); // -46
+
+ +

Exemplo: Ajuste Decimal

+ +
// Closure
+(function(){
+
+	/**
+	 * Decimal adjustment of a number.
+	 *
+	 * @param	{String}	type	The type of adjustment.
+	 * @param	{Number}	value	The number.
+	 * @param	{Integer}	exp		The exponent (the 10 logarithm of the adjustment base).
+	 * @returns	{Number}			The adjusted value.
+	 */
+	function decimalAdjust(type, value, exp) {
+		// If the exp is undefined or zero...
+		if (typeof exp === 'undefined' || +exp === 0) {
+			return Math[type](value);
+		}
+		value = +value;
+		exp = +exp;
+		// If the value is not a number or the exp is not an integer...
+		if (isNaN(value) || !(typeof exp === 'number' && exp % 1 === 0)) {
+			return NaN;
+		}
+		// Shift
+		value = value.toString().split('e');
+		value = Math[type](+(value[0] + 'e' + (value[1] ? (+value[1] - exp) : -exp)));
+		// Shift back
+		value = value.toString().split('e');
+		return +(value[0] + 'e' + (value[1] ? (+value[1] + exp) : exp));
+	}
+
+	// Decimal round
+	if (!Math.round10) {
+		Math.round10 = function(value, exp) {
+			return decimalAdjust('round', value, exp);
+		};
+	}
+	// Decimal floor
+	if (!Math.floor10) {
+		Math.floor10 = function(value, exp) {
+			return decimalAdjust('floor', value, exp);
+		};
+	}
+	// Decimal ceil
+	if (!Math.ceil10) {
+		Math.ceil10 = function(value, exp) {
+			return decimalAdjust('ceil', value, exp);
+		};
+	}
+
+})();
+
+// Round
+Math.round10(55.55, -1); // 55.6
+Math.round10(55.549, -1); // 55.5
+Math.round10(55, 1); // 60
+Math.round10(54.9, 1); // 50
+Math.round10(-55.55, -1); // -55.5
+Math.round10(-55.551, -1); // -55.6
+Math.round10(-55, 1); // -50
+Math.round10(-55.1, 1); // -60
+// Floor
+Math.floor10(55.59, -1); // 55.5
+Math.floor10(59, 1); // 50
+Math.floor10(-55.51, -1); // -55.6
+Math.floor10(-51, 1); // -60
+// Ceil
+Math.ceil10(55.51, -1); // 55.6
+Math.ceil10(51, 1); // 60
+Math.ceil10(-55.59, -1); // -55.5
+Math.ceil10(-59, 1); // -50
+
+ +

Especificações

+ + + + + + + + + + + + + + + + + + + + + + + + +
SpecificationStatusComment
ECMAScript 1st Edition. Implemented in JavaScript 1.0StandardInitial definition.
{{SpecName('ES5.1', '#sec-15.8.2.9', 'Math.floor')}}{{Spec2('ES5.1')}} 
{{SpecName('ES6', '#sec-math.floor', 'Math.floor')}}{{Spec2('ES6')}} 
+ +

Compatibilidade dos Browsers

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{{ CompatibilityTable() }}

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+ + + + + + + + + + + + + + + + + + + +
FeatureChromeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + +
FeatureAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}
+
+ +

Veja também

+ + -- cgit v1.2.3-54-g00ecf