JavaScript Tutorial/Operators/Operator Precedence — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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Текущая версия на 08:24, 26 мая 2010
Operator order in action
<html>
<head>
<title>A Simple Page</title>
<script language="JavaScript">
<!--
alert(3 - 1 * 6);
alert((3 - 1) * 6);
// -->
</script>
</head>
<body>
</body>
</html>
Operator Precedence from highest to lowest
Read From Operator Operator Name Left to Right . Object property access Left to Right [] Array index Left to Right () Function call Right to Left ++ Pre/Post Increment Right to Left -- Pre/Post Decrement Right to Left - Negation Right to Left ~ Bitwise NOT Right to Left ! Logical NOT Right to Left delete Undefine a property Right to Left new Create a new object Right to Left typeof Return data type Right to Left void Return undefined value Left to Right
- , /, %
Multiplication, division, modulus Left to Right +, - Addition, Subtraction Left to Right + String concatenation Left to Right << Left shift Left to Right >> Right shift with sign Left to Right >>> Right shift zero fill Left to Right <, <= Less than, less than or equal Left to Right >, >= Greater than, greater than or equal Left to Right == Equality Left to Right != Inequality Left to Right
=
Identity Left to Right !== Non-identity Left to Right & Bitwise AND Left to Right ^ Bitwise XOR Left to Right | Bitwise OR Left to Right && Logical AND Left to Right || Logical OR Right to Left ?: Conditional Right to Left = Assignment Right to Left
- =, /=
Assignment plus operation %=, +=, -=, <<=, >>=, >>>=, &=, ^=, |= Left to Right . Multiple evaluation
