Disallow Floating Decimals (no-floating-decimal)

禁止浮点小数 (no-floating-decimal)

The --fix option on the command line can automatically fix some of the problems reported by this rule.

命令行中的 --fix 选项可以自动修复一些该规则报告的问题。

Float values in JavaScript contain a decimal point, and there is no requirement that the decimal point be preceded or followed by a number. For example, the following are all valid JavaScript numbers:

在 JavaScript 中，浮点值会包含一个小数点，没有要求小数点之前或之后必须有一个数字。例如，以下例子都是有效的 JavaScript 数字：

var num = .5;
var num = 2.;
var num = -.7;

Although not a syntax error, this format for numbers can make it difficult to distinguish between true decimal numbers and the dot operator. For this reason, some recommend that you should always include a number before and after a decimal point to make it clear the intent is to create a decimal number.

虽然不是一个语法错误，这种格式的数字使真正的小数和点操作符变的难以区分。由于这个原因，有些人建议应该总是在小数点前面和后面有一个数字，以明确表明是要创建一个小数。

Rule Details

This rule is aimed at eliminating floating decimal points and will warn whenever a numeric value has a decimal point but is missing a number either before or after it.

此规则目的在于消除浮动小数点，并且，当数值的小数点之前或之后缺少数字时，该规则将发出警告。

Examples of incorrect code for this rule:

错误代码示例：

/*eslint no-floating-decimal: "error"*/

var num = .5;
var num = 2.;
var num = -.7;

Examples of correct code for this rule:

正确代码示例：

/*eslint no-floating-decimal: "error"*/

var num = 0.5;
var num = 2.0;
var num = -0.7;

When Not To Use It

If you aren’t concerned about misinterpreting floating decimal point values, then you can safely turn this rule off.

如果你并不担心误解浮点小数，你可以安全的关闭此规则。

Compatibility

JSHint: W008, W047

Version

This rule was introduced in ESLint 0.0.6.