11.9.3 The Abstract Equality Comparison Algorithm The comparison x == y, where x and y are values, produces true or false. Such a comparison is performed as follows: If Type(x) is the same as Type(...
...不清楚干掉。https://www.ecma-internationa...7.2.13 Abstract Equality Comparison The comparison x == y, where x and y are values, produces true or false. Such a comparison is performed as follows: 1. If T...
...等。详细信息可参照ECMA标准(戳这里)。 Abstract Equality Comparison == == 相等操作符,在比较前会把比较的两个数转换成相同的数据类型之后,然后对两个数进行比较。转换后,比较方式与 === 相同。 ECMA中比较规则如下: The compari...
... the same as Type(y), then Return the result of performing Strict Equality Comparison x === y. If x is null and y is undefined, return true. If x is undefined and y is null, return true. If Type(x)...
...ript 上去找找标准了。 ECMAScript® 2019 : 7.2.14 Abstract Equality Comparison 规范描述: The comparison x == y, where x and y are values, produces true or false. Such a comparison is performed as follows: If T...
...向同一个对象,返回 true, 否则返回 false Strict Equality Comparison js 中的全等(===)便是遵循这个规范,照搬规范如下: 如果 x 和 y 的类型不同,返回 false 如果 x 的为 Number 类型: a. 如果 x 为 NaN ,返回 false b. 如果 y 为 NaN ,...
...A 5.1 的规范,包含 toPrimitive: 规范 11.9.3 The Abstract Equality Comparison Algorithm If Type(x) is the same as Type(y), then If Type(x) is Undefined, return true. If Type(x) is Null, return true. If...
... say: If Type(x) is Number and Type(y) is String, return the result of the comparison x == ToNumber(y).If Type(x) is String and Type(y) is Number, return the result of the comparison ToNumber(x) ==...
...= 0 true 参考: 12.5.9 Logical NOT Operator (!) 7.2.13 Abstract Equality Comparison true 是 false !!false == !!true // -> true !!false === !!true // -> true true是一个真值,用1表示;字符串的true则为NaN。 true == tr...
...明白这个事还得去看规范(7.2.13-7.2.14): 关于 == 和 != The comparison x == y, where x and y are values, produces true or __false__. Such a comparison is performed as follows: If Type(x) is the same as Type(y),...
...ttps://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Comparison_Operators 如果其中一个操作数为布尔类型,那么布尔操作数如果为true,那么会转换为1,如果为false,会转换为整数0,即0。所以![]为false为0. [] == 0 第二步 转成 == ...
...ttps://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Comparison_Operators 如果其中一个操作数为布尔类型,那么布尔操作数如果为true,那么会转换为1,如果为false,会转换为整数0,即0。所以![]为false为0. [] == 0 第三步 转成 == ...
...中对SameValue(x, y)规范是: SameValue(value1, value2) The internal comparison abstract operation SameValue(x, y), where x and y are ECMAScript language values, produces true or false. Such a comparison...
...们可以将共享逻辑包装在isCuisine函数中。 const isCuisine = comparison => ({cuisine}) => cuisine === comparison; const isBurger = isCuisine(Burger); const isPizza = isCuisine(Pizza); 现在,如果我们想开始检查价格怎么办? const isP...
...们可以将共享逻辑包装在isCuisine函数中。 const isCuisine = comparison => ({cuisine}) => cuisine === comparison; const isBurger = isCuisine(Burger); const isPizza = isCuisine(Pizza); 现在,如果我们想开始检查价格怎么办? const isP...
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