与 Adobe After Effects 脚本相关的基本 JavaScript 元素

关键字和语句语法

Keyword/Statement	Description
`break`	Standard JavaScript; exit the currently executing loop.
`continue`	JavaScript; cease execution of the current loop iteration.
`case`	Label used in a `switch` statement.
`default`	Label used in a `switch` statement when a `case` label is not found.
`do...while`	Standard JavaScript construct. Similar to the while loop, except loop condition evaluation occurs at the end of the loop.
`false`	Literal representing the Boolean false value.
`for`	Standard JavaScript loop construct.
`for...in`	Standard JavaScript construct. Provides a way to easily loop through the properties of an object.
`function`	Used to define a function.
`if/if...else`	Standard JavaScript conditional constructs.
`new`	Standard JavaScript constructor statement.
`null`	Assigned to a variable, array element, or object property to indicate that it does not contain a legalvalue.
`return`	Standard JavaScript way of returning a value from a function or exiting a function.
`switch`	Standard JavaScript way of evaluating a JavaScript expression and attempting to match the expression’s value to a `case` label.
`this`	Standard JavaScript method of indicating the current object.
`true`	Literal representing the Boolean true value.
`undefined`	Indicates that the variable, array element, or object property has not yet been assigned a value.
`var`	Standard JavaScript syntax used to declare a local variable.
`while`	Standard JavaScript construct. Similar to the do…whileloop, except loop condition evaluation occurs at the beginning of the loop.
`with`	Standard JavaScript construct used to specify an object to use in subsequent statements.

JavaScript运算符

Operators	Description
`new`	Create new object instance.
`delete`	Delete property from an object.
`typeof`	Returns data type.
`void`	Returns undefined value.
`.`	Object member.
`[]`	Array element.
`()`	Function call.
`++`	Pre- or post-increment.
`--`	Pre- or post-decrement.
`-`	Unary negation or subtraction.
`~`	Bitwise NOT.
`!`	Logical NOT.
`*`	Multiply.
`/`	Divide.
`%`	Modulo division.
`+`	Add.
`<<`	Bitwise left shift.
`>>`	Bitwise right shift.
`>>>`	Unsigned bitwise right shift.
`<`	Less than.
`<=`	Less than or equal.
`>`	Greater than.
`>=`	Greater than or equal.
`==`	Equal.
`!=`	Not equal.
`&`	Bitwise AND.
`^`	Bitwise XOR.
`\|`	Bitwise OR.
`&&`	Logical AND.
`\|\|`	Logical OR.
`?:`	Conditional (ternary).
`=`	Assignment.
`+=`	Assignment with add operation.
`-=`	Assignment with subtract operation.
`*=`	Assignment with multiply operation.
`/=`	Assignment with divide operation.
`%=`	Assignment with modulo division operation.
`<<=`	Assignment with bitwise left shift operation.
`>>=`	Assignment with bitwise right shift operation.
`>>>=`	Assignment with unsigned bitwise right shift operation.
`&=`	Assignment with bitwise AND operation.
`^=`	Assignment with bitwise XOR operation.
`\|=`	Assignment with bitwise OR operation.
`,`	Multiple evaluation.

运算符优先级

Operators (highest precedence to lowest)	Associativity
[], (), .	left to right
new, delete, – (unary negation), !, type of, void , ++, –	right to left
*, /, %	left to right
+, – (subtraction)	left to right
<<, >>, >>>	left to right
<, <=, >, >=	left to right
= =, ! =	left to right
&	left to right
^	left to right
\|	left to right
&&	left to right
\|\|	left to right
?:	right to left
==, /=, %=, <<=, >>=, >>>=, &=, ^=, \|=, +=, -=, *=	right to left
,	left to right

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与 Adobe After Effects 脚本相关的基本 JavaScript 元素

关键字和语句语法

JavaScript运算符

运算符优先级

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