语法错误：缺少：属性 id 之后

¥Message

SyntaxError: Invalid shorthand property initializer (V8-based)
SyntaxError: missing : after property id (Firefox)
SyntaxError: Unexpected token '='. Expected a ':' following the property name 'x'. (Safari)
SyntaxError: Unexpected token '+'. Expected an identifier as property name. (Safari)

¥Error type

¥What went wrong?

使用 对象初始值设定项 语法创建对象时，冒号 (:) 分隔对象属性的键和值。

¥When creating objects with the object initializer syntax, a colon (:) separates keys and values for the object's properties.

const obj = { propertyKey: "value" };

¥Examples

¥Colons vs. equal signs

此代码失败，因为在此对象初始值设定项语法中不能以这种方式使用等号。

¥This code fails, as the equal sign can't be used this way in this object initializer syntax.

const obj = { propertyKey = "value" };
// SyntaxError: missing : after property id

正确的方法是在创建对象后使用冒号或方括号来分配新属性。

¥Correct would be to use a colon, or to use square brackets to assign a new property after the object has been created already.

const obj = { propertyKey: "value" };

或者：

¥Or alternatively:

const obj = {};
obj.propertyKey = "value";

¥Computed properties

如果从表达式创建属性键，则需要使用方括号。否则无法计算属性名称：

¥If you create a property key from an expression, you need to use square brackets. Otherwise the property name can't be computed:

const obj = { "b"+"ar": "foo" };
// SyntaxError: missing : after property id

将表达式放在方括号 [] 中：

¥Put the expression in square brackets []:

const obj = { ["b" + "ar"]: "foo" };

¥See also

• 对象初始值设定项