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。詳細信息可參照ECMA標準(戳這里)。 Abstract Equality Comparison == == 相等操作符,在比較前會把比較的兩個數轉換成相同的數據類型之后,然后對兩個數進行比較。轉換后,比較方式與 === 相同。 ECMA中比較規則如下: 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 上去找找標準了。 ECMAScript? 2019 : 7.2.14 Abstract Equality Comparison 規范描述: The comparison x == y, where x and y are values, produces true or false. Such a comparison is performed as follows: If T...
...向同一個對象,返回 true, 否則返回 false Strict Equality Comparison js 中的全等(===)便是遵循這個規范,照搬規范如下: 如果 x 和 y 的類型不同,返回 false 如果 x 的為 Number 類型: a. 如果 x 為 NaN ,返回 false b. 如果 y 為 NaN ,...
...A 5.1 的規范,包含 toPrimitive: 規范 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 參考: 12.5.9 Logical NOT Operator (!) 7.2.13 Abstract Equality Comparison true 是 false !!false == !!true // -> true !!false === !!true // -> true true是一個真值,用1表示;字符串的true則為NaN。 true == tr...
...明白這個事還得去看規范(7.2.13-7.2.14): 關于 == 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 如果其中一個操作數為布爾類型,那么布爾操作數如果為true,那么會轉換為1,如果為false,會轉換為整數0,即0。所以![]為false為0. [] == 0 第二步 轉成 == ...
...ttps://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Comparison_Operators 如果其中一個操作數為布爾類型,那么布爾操作數如果為true,那么會轉換為1,如果為false,會轉換為整數0,即0。所以![]為false為0. [] == 0 第三步 轉成 == ...
...中對SameValue(x, y)規范是: 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...
...們可以將共享邏輯包裝在isCuisine函數中。 const isCuisine = comparison => ({cuisine}) => cuisine === comparison; const isBurger = isCuisine(Burger); const isPizza = isCuisine(Pizza); 現在,如果我們想開始檢查價格怎么辦? const isP...
...們可以將共享邏輯包裝在isCuisine函數中。 const isCuisine = comparison => ({cuisine}) => cuisine === comparison; const isBurger = isCuisine(Burger); const isPizza = isCuisine(Pizza); 現在,如果我們想開始檢查價格怎么辦? const isP...
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