JavaScript表达式与运算符（国外英文资料）.doc

JavaScript表达式与运算符（国外英文资料） Expressions are similar to definitions in mathematics, and expressions refer to the algebraic expressions that have certain values, using operators to connect constants and variables. An expression can contain only a constant or a variable. Operators can be four operators, relational operators, bit operators, logical operators, and compound operators. The following table ranks these operators from high priority to low priority: Parentheses (x) [x] brackets are used only to indicate the index of the array Complementation, Since the addition, So this is the inverse of x ! X returns the Boolean value against x (Boolean value) X + + x is plus 1, but it still returns the original x value X minus 1, but it still returns the original x value Plus x is plus 1, and then you go back to the x value X value minus 1, return x value Times x times y times the value of x times y X over y returns x over y X % y returns the magnitude of x and y (x divided by the remainder of y) Plus, minus x plus y is going to return x plus y X minus y returns x minus y The relation operation x y x = y X = y x y returns the true value when it meets the criteria, otherwise the false value is returned Equal to, Its not equal to x equals y when x is equal to y and return true when x is equal to y, otherwise we return false X!!! = y return true value when x does not equal y, otherwise return false When two digits are equal to 1, the current digit of the returned data is 1, and the other cases are 0 An exclusive or x ^ y one and only one of the two digital to 0, return 0, otherwise it returns 1 So if you have one in the two digits or one in x, you return 1; It returns zero when both digits are zero Bitwise operators are often used as logical operators. Its actual operation situation is: the two operands (i.e., x and y) into a binary number, to perform the work listed above, each digital before returning to get new binary number. Due to the true value (usually) within the comp