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Operators, also known as "operators", are symbols used to tell the JavaScript engine to perform certain operations, such as the plus sign "+" for addition, the minus sign for subtraction, and so on. Javascript operators include arithmetic operators, bit operators, assignment operators, comparison operators, and so on.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

Javascript operator

Operators, also known as "operators", are symbols used to tell the JavaScript engine to perform certain operations, such as the plus sign "+" for addition, the minus sign for subtraction, and so on.

JavaScript's operators apply to many values, such as strings, numeric values, Boolean values, and even objects. When applied to an object, the corresponding operator calls the object's valueOf () and / or toString () methods to get the values that can be manipulated.

Arithmetic operator

Arithmetic operators are used to perform common mathematical operations, such as addition, subtraction, multiplication, division, and so on. The following table lists the arithmetic operators supported in JavaScript:

Operator description example + addition operator x + y for sum-subtraction operator x-y for calculation x minus y * multiplication operator x * y for product / division operator x / y for calculation x divided by y quotient% modulus (remainder) operator x% y represents the remainder of calculation x divided by y

Assignment operator

Assignment operators are used to assign values to variables, and the following table lists the assignment operators supported in JavaScript:

Operator description example = the simplest assignment operator, assigning the value on the right side of the operator to the variable x = 10 on the left side of the operator means that the variable x = 10 is assigned to do the addition operation first, and then assign the result to the variable x + = y on the left side of the operator equal to x = x + y color = to do subtraction first, and then assign the result to the variable x-= y on the left side of the operator equal to x = x-y = first multiply Then the result is assigned to the variable x * = y on the left side of the operator is equivalent to x = x * y = first divide, and then the result is assigned to the variable x / = y on the left side of the operator is equal to x = x / y% =. Then assign the result to the variable x% = y on the left side of the operator is equal to x = x% y

Comparison operator

The comparison operator is used to compare the expressions on the left and right sides of the operator. The result of the comparison operator is a Boolean value, and there are only two results, either true or false. The comparison operators supported in JavaScript are listed in the following table:

Operator name example = = equal to x = = y means true if x is equal to y, true = = congruent x = y means true if x is equal to y and x and y are of the same type, then true! = unequal x! = y means true if x is not equal to y, then true! = incomplete equal x! = y means if x is not equal to y, or if x and y have different types, then true is greater than x > y means that if x is greater than y True > = greater than or equal to x > = y means that if x is greater than or equal to y, the result is 0010, the decimal result is 2 > move zero to the right by bit (unsigned right shift): move all binary bits to the right by the specified number of digits, and the leftmost complement 05 > > 1 equals 0101 > 1 the result is 0010, and the decimal result is 2.

Self-increasing and self-decreasing operators

The self-increment and self-subtraction operators are used to perform self-increment (+ 1) and self-subtraction (- 1) operations on the values of variables. The following table lists the self-increment and self-subtraction operators supported in JavaScript:

The operator name affects + + x the self-increasing operator adds x to 1, then returns the value of x, and then the self-increasing operator returns the value of x, then subtracts x by 1, then subtracts x by 1, and then returns the value of x by the x-self-subtraction operator, and then subtracts x by 1.

Ternary operator

The ternary operator (also known as the conditional operator) consists of a question mark and a colon and has the following syntax format:

Conditional expression? Expression 1: expression 2

If the result of the conditional expression is true (true), the code in expression 1 is executed, otherwise the code in expression 2 is executed.

Description: string operation

The + and + = operators in JavaScript can not only perform mathematical operations, but also be used to concatenate strings, where:

The + operator means to concatenate the strings on the left and right sides of the operator.

The + = operator means that the string is concatenated and then the result is assigned to the variable to the left of the operator.

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