JavaScript | Math.round()方法 (JavaScript | Math.round() Method)
Math.round() is a function in math library of JavaScript that is used to round the given number floating-point number to the nearest integer value.
Math.round()是JavaScript數學庫中的函數，用于將給定數字浮點數舍入到最接近的整數值。
It works in a way that if the fraction part is smaller than 0.5 it rounds down (nearest integer small than it) and if the fraction part is greater than 0.5 it rounds up (nearest integer greater than it).
它的工作方式是，如果小數部分小于0.5，則四舍五入(最接近的整數小于它)，如果小數部分大于0.5，則四舍五入(最近的整數大于它)。
Syntax:
句法：
Math.round(value);
Parameter(s):
參數：
value – represent the value to be rounded.
值 –表示要四舍五入的值。
Return value:
返回值：
The return type of this method is number, it returns the value which is nearest integer of the given value.
該方法的返回類型為number ，它返回的值是給定值的最接近整數。
Values accepted: Integer, floating-point, numeric string.
接受的值：整數，浮點數，數字字符串。
Invalid Values: non-numeric string, empty variable, empty array all will return NaN (Not a Number).
無效值：非數字字符串，空變量，空數組都將返回NaN(非數字)。
Browser support: Chrome, Internet asinlorer, Mozilla, Safari, Opera mini.
瀏覽器支持： Chrome，Internet代理，Mozilla，Safari，Opera mini。
Example 1: Valid values
示例1：有效值
console.log(Math.round(5.49999));
console.log(Math.round(-3.500121));
console.log(Math.round(0.990));
console.log(Math.round("-12.65"));
Output
輸出量
5
-3
1
-11
Example 2: Invalid values
示例2：無效值
console.log(Math.round("Javascript"));
Output
輸出量
NaN
翻譯自: https://www.includehelp.com/code-snippets/math-round-method-with-example-in-javascript.aspx
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