---
title: Expressions and operators
slug: Web/JavaScript/Reference/Operators
tags:
- بازبینی
- جاوااسکریپت
- عملوند
- منابع
translation_of: Web/JavaScript/Reference/Operators
---
{{jsSidebar("Operators")}}
این بخش از سند شامل تمامی عمل ها و عبارت و کلمات کلیدی بکار رفته در زبان برنامه نویسی جاوااسکریپت می باشد.
دسته بندی عبارت و عمل ها
لیست زیر براساس الفابت انگلیسی مرتب شده است
عبارات اصلی
عبارت عمومی و کلمات کلیدی اصلی در جاوا اسکریپت.
- {{jsxref("Operators/this", "this")}}
- کلمه کلیدی
this
به محتوایی در درون تابعی که در آن نوشته شده است اشاره می کند.
- {{jsxref("Operators/function", "function")}}
- کلمه کلیدی
function
٫ تعریف کننده یک تابع است.
- {{jsxref("Operators/class", "class")}}
- کلمه کلیدی
class
٫ تعریف کننده یک کلاس است.
- {{jsxref("Operators/function*", "function*")}}
- کلمه کلیدی
function*
تعریف کننده یک سازنده کلاس است.
- {{jsxref("Operators/yield", "yield")}}
- مکث و از سرگیری می کند تابعی که تولید شده است.
- {{jsxref("Operators/yield*", "yield*")}}
- محول می کند به تابع یا آبجکت تولید شده دیگر.
- {{experimental_inline}} {{jsxref("Operators/async_function", "async function*")}}
async function
یک تابع async تعریف می کند
- {{experimental_inline}} {{jsxref("Operators/await", "await")}}
- مکث و از سرگیری می کند و تابع اسینک (async ) و منتظر اجازه برای تایید را رد می ماند
- {{jsxref("Global_Objects/Array", "[]")}}
- تعریف کننده /سازنده یک آرایه .
- {{jsxref("Operators/Object_initializer", "{}")}}
- تعریف کننده / سازنده یک آبجکت ( شئی) .
- {{jsxref("Global_Objects/RegExp", "/ab+c/i")}}
- یک ترکیب صحیح از عبارتها
- {{jsxref("Operators/Grouping", "( )")}}
- دسته بندی عمل ها
عبارت های سمت چپ
مقدارهای سمت چپ مشخص کردن هدف هستند
- {{jsxref("Operators/Property_accessors", "Property accessors", "", 1)}}
- عمل های شامل درستی به یک ویژگی یا متد از یک آبجکت(شئی) از قبل تعریف شده
(object.property
و object["property"]
).
- {{jsxref("Operators/new", "new")}}
- عمل
new
یک سازنده از الگو یا موجودیت از قبل تعریف شده مثل آبجکت
- new.target
- In constructors,
new.target
refers to the constructor that was invoked by {{jsxref("Operators/new", "new")}}.
- {{jsxref("Operators/super", "super")}}
- کلیدواژه
super
والد سازنده را صدا می زند
- {{jsxref("Operators/Spread_operator", "...obj")}}
- The spread operator allows an expression to be expanded in places where multiple arguments (for function calls) or multiple elements (for array literals) are expected.
افزایش و کاهش
عملوند پیشوندی/ پسوندی افزایشی و عملوند پیشوندی/پسوندی کاهشی
- {{jsxref("Operators/Arithmetic_Operators", "A++", "#Increment")}}
- عملوند پسوندی افزایشی.
- {{jsxref("Operators/Arithmetic_Operators", "A--", "#Decrement")}}
- عملوند پسوندی کاهشی.
- {{jsxref("Operators/Arithmetic_Operators", "++A", "#Increment")}}
- عملوند پیشوندی افزایشی.
- {{jsxref("Operators/Arithmetic_Operators", "--A", "#Decrement")}}
- عملوند پیشوند کاهشی
عملوند های یکتا
A unary operation is operation with only one operand.
- {{jsxref("Operators/delete", "delete")}}
- عملوند
delete
ویژگی /ها را از یک آبجکت حذف می کند.
- {{jsxref("Operators/void", "void")}}
- در عمل کننده
void
مقداری برای بازگشت از یک عبارت وجود ندارد.
- {{jsxref("Operators/typeof", "typeof")}}
typeof
نوع آبجکت (شئی )دریافتی را مشخص می کند.
- {{jsxref("Operators/Arithmetic_Operators", "+", "#Unary_plus")}}
- The unary plus operator converts its operand to Number type.
- {{jsxref("Operators/Arithmetic_Operators", "-", "#Unary_negation")}}
- The unary negation operator converts its operand to Number type and then negates it.
- {{jsxref("Operators/Bitwise_Operators", "~", "#Bitwise_NOT")}}
- Bitwise NOT operator.
- {{jsxref("Operators/Logical_Operators", "!", "#Logical_NOT")}}
- Logical NOT operator.
عملوند های منطقی
عملوندهای منطقی روی مقدار عددی اعمال می شوند و یک عدد به عنوان نتیجه منطقی عملوند منطقی خواهد بود
- {{jsxref("Operators/Arithmetic_Operators", "+", "#Addition")}}
- عمل جمع.
- {{jsxref("Operators/Arithmetic_Operators", "-", "#Subtraction")}}
- عمل تفریق/منها
- {{jsxref("Operators/Arithmetic_Operators", "/", "#Division")}}
- عمل تقسیم
- {{jsxref("Operators/Arithmetic_Operators", "*", "#Multiplication")}}
- عمل ضرب
- {{jsxref("Operators/Arithmetic_Operators", "%", "#Remainder")}}
- عمل تقسیم / خروجی باقیماند تقسیم
- {{jsxref("Operators/Arithmetic_Operators", "**", "#Exponentiation")}}
- عمل توان
Relational operators
A comparison operator compares its operands and returns a Boolean
value based on whether the comparison is true.
- {{jsxref("Operators/in", "in")}}
- The
in
operator determines whether an object has a given property.
- {{jsxref("Operators/instanceof", "instanceof")}}
- The
instanceof
operator determines whether an object is an instance of another object.
- {{jsxref("Operators/Comparison_Operators", "<", "#Less_than_operator")}}
- Less than operator.
- {{jsxref("Operators/Comparison_Operators", ">", "#Greater_than_operator")}}
- Greater than operator.
- {{jsxref("Operators/Comparison_Operators", "<=", "#Less_than_or_equal_operator")}}
- Less than or equal operator.
- {{jsxref("Operators/Comparison_Operators", ">=", "#Greater_than_or_equal_operator")}}
- Greater than or equal operator.
Equality operators
The result of evaluating an equality operator is always of type Boolean
based on whether the comparison is true.
- {{jsxref("Operators/Comparison_Operators", "==", "#Equality")}}
- Equality operator.
- {{jsxref("Operators/Comparison_Operators", "!=", "#Inequality")}}
- Inequality operator.
- {{jsxref("Operators/Comparison_Operators", "===", "#Identity")}}
- Identity operator.
- {{jsxref("Operators/Comparison_Operators", "!==", "#Nonidentity")}}
- Nonidentity operator.
Bitwise shift operators
Operations to shift all bits of the operand.
- {{jsxref("Operators/Bitwise_Operators", "<<", "#Left_shift")}}
- Bitwise left shift operator.
- {{jsxref("Operators/Bitwise_Operators", ">>", "#Right_shift")}}
- Bitwise right shift operator.
- {{jsxref("Operators/Bitwise_Operators", ">>>", "#Unsigned_right_shift")}}
- Bitwise unsigned right shift operator.
Binary bitwise operators
Bitwise operators treat their operands as a set of 32 bits (zeros and ones) and return standard JavaScript numerical values.
- {{jsxref("Operators/Bitwise_Operators", "&", "#Bitwise_AND")}}
- Bitwise AND.
- {{jsxref("Operators/Bitwise_Operators", "|", "#Bitwise_OR")}}
- Bitwise OR.
- {{jsxref("Operators/Bitwise_Operators", "^", "#Bitwise_XOR")}}
- Bitwise XOR.
Binary logical operators
Logical operators are typically used with boolean (logical) values, and when they are, they return a boolean value.
- {{jsxref("Operators/Logical_Operators", "&&", "#Logical_AND")}}
- Logical AND.
- {{jsxref("Operators/Logical_Operators", "||", "#Logical_OR")}}
- Logical OR.
Conditional (ternary) operator
- {{jsxref("Operators/Conditional_Operator", "(condition ? ifTrue : ifFalse)")}}
-
The conditional operator returns one of two values based on the logical value of the condition.
Assignment operators
An assignment operator assigns a value to its left operand based on the value of its right operand.
- {{jsxref("Operators/Assignment_Operators", "=", "#Assignment")}}
- Assignment operator.
- {{jsxref("Operators/Assignment_Operators", "*=", "#Multiplication_assignment")}}
- Multiplication assignment.
- {{jsxref("Operators/Assignment_Operators", "/=", "#Division_assignment")}}
- Division assignment.
- {{jsxref("Operators/Assignment_Operators", "%=", "#Remainder_assignment")}}
- Remainder assignment.
- {{jsxref("Operators/Assignment_Operators", "+=", "#Addition_assignment")}}
- Addition assignment.
- {{jsxref("Operators/Assignment_Operators", "-=", "#Subtraction_assignment")}}
- Subtraction assignment
- {{jsxref("Operators/Assignment_Operators", "<<=", "#Left_shift_assignment")}}
- Left shift assignment.
- {{jsxref("Operators/Assignment_Operators", ">>=", "#Right_shift_assignment")}}
- Right shift assignment.
- {{jsxref("Operators/Assignment_Operators", ">>>=", "#Unsigned_right_shift_assignment")}}
- Unsigned right shift assignment.
- {{jsxref("Operators/Assignment_Operators", "&=", "#Bitwise_AND_assignment")}}
- Bitwise AND assignment.
- {{jsxref("Operators/Assignment_Operators", "^=", "#Bitwise_XOR_assignment")}}
- Bitwise XOR assignment.
- {{jsxref("Operators/Assignment_Operators", "|=", "#Bitwise_OR_assignment")}}
- Bitwise OR assignment.
- {{jsxref("Operators/Destructuring_assignment", "[a, b] = [1, 2]")}}
{{jsxref("Operators/Destructuring_assignment", "{a, b} = {a:1, b:2}")}}
-
Destructuring assignment allows you to assign the properties of an array or object to variables using syntax that looks similar to array or object literals.
Comma operator
- {{jsxref("Operators/Comma_Operator", ",")}}
- The comma operator allows multiple expressions to be evaluated in a single statement and returns the result of the last expression.
Non-standard features
- {{non-standard_inline}} {{jsxref("Operators/Legacy_generator_function", "Legacy generator function", "", 1)}}
- The
function
keyword can be used to define a legacy generator function inside an expression. To make the function a legacy generator, the function body should contains at least one {{jsxref("Operators/yield", "yield")}} expression.
- {{non-standard_inline}} {{jsxref("Operators/Expression_closures", "Expression closures", "", 1)}}
- The expression closure syntax is a shorthand for writing simple function.
- {{non-standard_inline}} {{jsxref("Operators/Array_comprehensions", "[for (x of y) x]")}}
- Array comprehensions.
- {{non-standard_inline}} {{jsxref("Operators/Generator_comprehensions", "(for (x of y) y)")}}
- Generator comprehensions.
Specifications
Specification |
Status |
Comment |
{{SpecName('ES1', '#sec-11', 'Expressions')}} |
{{Spec2('ES1')}} |
Initial definition |
{{SpecName('ES5.1', '#sec-11', 'Expressions')}} |
{{Spec2('ES5.1')}} |
|
{{SpecName('ES6', '#sec-ecmascript-language-expressions', 'ECMAScript Language: Expressions')}} |
{{Spec2('ES6')}} |
New: Spread operator, destructuring assignment, super keyword. |
{{SpecName('ESDraft', '#sec-ecmascript-language-expressions', 'ECMAScript Language: Expressions')}} |
{{Spec2('ESDraft')}} |
|
See also