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How to keep two decimal places in javascript

藏色散人
Release: 2019-06-18 09:10:42
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How to keep two decimal places in javascript

Below we will introduce to you the implementation method of retaining two decimal places in JavaScript:

Rounding

The following processing results will be Rounding:

var num =2.446242342;
num = num.toFixed(2);  // 输出结果为 2.45
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No rounding

The following processing results will not be rounded.

The first one, first convert the decimal into an integer:

Math.floor(15.7784514000 * 100) / 100   // 输出结果为 15.77
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The second one, treat it as a string, use regular matching:

Number(15.7784514000.toString().match(/^\d+(?:\.\d{0,2})?/))   // 输出结果为 15.77,不能用于整数如 10 必须写为10.0000
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Note: If it is a negative number, please First convert it to a positive number and then calculate it, and finally convert it back to a negative number

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