no-loss-of-precision
Disallow literal numbers that lose precision
✅ Recommended
The "extends": "eslint:recommended"
property in a configuration file enables this rule
这条规则将不允许使用在运行时由于 64 位浮点四舍五入而在转换为 JS Number
时失去精度的数字字面。
规则细节
在 JS 中,根据 IEEE 754 标准,Number
被存储为双精度浮点数字。正因为如此,数字只能保持一定数量的精度。如果程序员输入额外的数字,这些数字将在转换为 Number
类型的过程中丢失,并会导致意外行为。
使用此规则的错误示例:
Open in Playground
/*eslint no-loss-of-precision: "error"*/
const x = 9007199254740993
const x = 5123000000000000000000000000001
const x = 1230000000000000000000000.0
const x = .1230000000000000000000000
const x = 0X20000000000001
const x = 0X2_000000000_0001;
使用此规则的正确示例:
Open in Playground
/*eslint no-loss-of-precision: "error"*/
const x = 12345
const x = 123.456
const x = 123e34
const x = 12300000000000000000000000
const x = 0x1FFFFFFFFFFFFF
const x = 9007199254740991
const x = 9007_1992547409_91
Version
This rule was introduced in ESLint v7.1.0.