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JavaScript参考手册

错误 | Errors

Errors: Missing colon after property id

信息

SyntaxError: missing : after property id

错误类型

SyntaxError

什么地方出了错?

使用对象初始值设定项语法创建对象时,冒号(:)会分隔对象属性的键和值。

var obj = { propertyKey: 'value' };

Examples

冒号与等号

此代码失败,因为在此对象初始值设定项语法中等号不能以此方式使用。

var obj = { propertyKey = 'value' };
// SyntaxError: missing : after property id

正确的做法是使用冒号,或者在创建对象之后使用方括号来分配新的属性。

var obj = { propertyKey: 'value' };

// or alternatively

var obj = { };
obj['propertyKey'] = 'value';

Empy属性

你不能像这样创建空的属性:

var obj = { propertyKey; };
// SyntaxError: missing : after property id

如果您需要定义一个没有值的属性,您可以将其null用作值。

var obj = { propertyKey: null };

计算属性

如果从表达式创建属性键,则需要使用方括号。否则,属性名称不能被计算:

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

把表达式放在括号内[]

var obj = { ['b'+'ar']: 'foo' };

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JavaScript

JavaScript 是一种高级编程语言,通过解释执行,是一门动态类型,面向对象(基于原型)的解释型语言。它已经由ECMA(欧洲电脑制造商协会)通过 ECMAScript 实现语言的标准化。它被世界上的绝大多数网站所使用,也被世界主流浏览器( Chrome、IE、FireFox、Safari、Opera )支持。JavaScript 是一门基于原型、函数先行的语言,是一门多范式的语言,它支持面向对象编程,命令式编程,以及函数式编程。它提供语法来操控文本、数组、日期以及正则表达式等,不支持 I/O,比如网络