javascript 属性名称中是否允许使用破折号？
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Are dashes allowed in javascript property names?
提问by xecaps12
I was looking at http://docs.jquery.com/Plugins/Authoring#Defaults_and_Optionsto create a simple plugin for jQuery. Following the section about options and settings, I did the following, which didn't work (the script quit when it encountered the setting).
我正在查看http://docs.jquery.com/Plugins/Authoring#Defaults_and_Options为 jQuery 创建一个简单的插件。按照有关选项和设置的部分，我做了以下操作，但不起作用（脚本在遇到设置时退出）。
var settings = {
'location' : 'top',
'background-color': 'blue'
}
...
$this.css('backgroundColor', settings.background-color); // fails here
Once I removed the dash from the background color, things work properly.
从背景颜色中删除破折号后，一切正常。
var settings = {
'location' : 'top',
'backgroundColor': 'blue' // dash removed here
}
...
$this.css('backgroundColor', settings.backgroundColor);
Am I missing something, or are the jQuery docs wrong?
我错过了什么，还是 jQuery 文档错了？
回答by Daniel A. White
no. the parser will interpret it as the subtract operator.
不。解析器将其解释为减法运算符。
you can do settings['background-color'].
你可以settings['background-color']。
回答by Rocket Hazmat
Change settings.background-colorto settings['background-color'].
更改settings.background-color为settings['background-color']。
Variables cannot contain -because that is read as the subtract operator.
变量不能包含，-因为它被读取为减法运算符。
回答by JaredPar
Dashes are not legal in javascript variables. A variable name must start with a letter, dollar sign or underscore and can be followed by the same or a number.
破折号在 javascript 变量中是不合法的。变量名必须以字母、美元符号或下划线开头，后跟相同或数字。
回答by sdleihssirhc
You can have dashes in strings. If you really wanted to keep that dash, you'd have to refer to the property using brackets and whatnot:
您可以在字符串中使用破折号。如果你真的想保留那个破折号，你必须使用括号和诸如此类的东西来引用属性：
$this.css('backgroundColor', settings['background-color']);
回答by Primoz Rome
You can do something like this:
你可以这样做：
var myObject = {
propertyOne: 'Something',
'property-two': 'Something two'
}
var result1 = myObject.propertyOne
var result2 = myObject['propertyOne']
var result3 = myObject['property-two']
