Logical Operators Precedence An expression may have more than one logical operators in JavaScript. In such situation, the operators are evaluated on the basis of their precedence. The NOT (!) operator has the highest precedence. Then AND (&&) operator has the higher precedence than OR (||) ...
When operators have the same precedence (like + and -), they are computed from left to right: letx =100/50*3; Try it Yourself » Operator Precedence Values Expressions in parentheses are computedbeforethe rest of the expression Function are executedbeforethe result is used in the rest of...
运算符优先级 以下表达式可能看起来是等价的,但实际上它们不是,因为 && 运算符在 || 之前执行 运算符。 true||false&&false// returns true, because && is executed first(true||false)&&false// returns false, because operator precedence cannot apply 一些例子 以下代码显示了 || 的示例 (逻辑或)运算符。
Logical NOT (!) Logical OR (||) Logical OR assignment (||=) Logical nullish assignment (??=) Multiplication (*) Multiplication assignment (*=) Nullish coalescing operator (??) Object initializer Operator precedence Optional chaining (?.) Pipeline operator (|>) Property accessors Remainder (%...
See Also: JavaScript Operator Precedence❮ Previous Next ❯ Track your progress - it's free! Log in Sign Up COLOR PICKER PLUS SPACES GET CERTIFIED FOR TEACHERS FOR BUSINESS CONTACT US Top Tutorials HTML Tutorial CSS Tutorial JavaScript Tutorial How To Tutorial SQL Tutorial Python Tutorial W3....
() (Grouping) It allows to change the operator precedence. yield It is used to pause and resume a generator function. … (Spread) It is used to expand the iterables such as array or string. ** (Exponentiation) Raises the left operand to the power of the right operandPrint...
优先级(precedence)决定了运算的先后次序,结合律(associativity)决定了在优先级相同的情况下,运算的左右顺序。 有两种结合律: 从左到右 从右到左 转义Escape 定义一个字符串必须要用单引号或双引号来包裹它。 那么当字符串里面包含引号"或者'时,在 JavaScript 中,可以通过在引号前面使用反斜杠(\)来转义引号。
Operator precedence determines the order in which operators are evaluated. Operators with higher precedence are evaluated first. A common example: 3 + 4 * 5 // returns 23 The multiplication operator ("*") has higher precedence than the addition operator ("+") and thus will be evaluated firs...
Table 2-1. Operator precedence . [] ( ) Refinement and invocation delete new typeof + - ! Unary operators * / % Multiplication, division, modulo + - Addition/concatenation, subtraction >= <= > < Inequality === !== Equality && Logical and ...
https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Operator_Precedence falsy值 (虚值):https://developer.mozilla.org/zh-CN/docs/Glossary/Falsy 这意味着当 JavaScript 期望一个布尔值,并被给与下面值中的一个时,它总是会被当做 false。