How to round in javascript without decimals

Method: 1. Use the "parseInt(numeric)" statement to round; 2. Use the "numeric.toFixed(0)" statement to round; 3. Use the "Math.ceil(numeric)" statement to round ; 4. Use the "Math.floor (numeric value)" statement to round; 5. Use the "Math.round (numeric value)" statement to round to an integer, etc.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

In JavaScript, if a value does not have decimals (remove the decimal part), it can be rounded. Let me introduce to you some JavaScript rounding methods.

How to round in javascript (no decimals)

##1. parseInt()

// js内置函数，注意接受参数是string，所以调用该方法时存在类型转换
parseInt(1.5555) // => 1

2. Number.toFixed(0)

// 注意toFixed返回的字符串，若想获得整数还需要做类型转换
1.5555.toFixed(0)  // => "1"

3. Math.ceil()

// 向上取整
Math.ceil(1.5555) // => 2

4. Math. floor()

// 向下取整
Math.floor(1.5555) // => 1

5. Math.round()

// 四舍五入取整
Math.round(1.5555) // => 2

Math.round(1.4999) // => 1

6. Math.trunc()

// 舍弃小数取整
Math.trunc(1.5555) // => 1

7. Double bitwise operation and non-rounding

// 利用位运算取整，仅支持32位有符号整型数，小数位会舍弃，下同
~~1.5555 // => 1

8. Bitwise operation or rounding

1.5555 | 0  // => 1

9. Bitwise XOR rounding

1.5555^0  // => 1

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