如何引用带有连字符的javascript对象属性？ [英] How do I reference a javascript object property with a hyphen in it?
问题描述
使用此脚本制作所有继承等样式的样式对象。
Using this script to make a style object of all the inherited etc styles.
var style = css($(this));
alert (style.width);
alert (style.text-align);
如下所示，第一个警报可以正常工作，但第二个警报没有..它是将 - 解释为减去我假设..调试器说'未捕获的引用错误'。不过，我不能在它周围加上引号，因为它不是一个字符串。那么我该如何使用这个对象属性？
with the following, the first alert will work fine, but the second one doesn't.. it's interpreting the - as a minus I assume.. the debugger says 'uncaught reference error'. I can't put quotes around it, though, because it isn't a string. So how do I use this object property?
推荐答案
编辑
查看您将看到的注释，对于css属性，键符号与许多属性不兼容。因此，使用驼峰案例键符号是当前的方式
Look at the comments you will see that for css properties key notation is not compatible with a number of properties. Using the camel case key notation therefore is the current way
obj.style-attr // would become
obj["styleAttr"]
使用密钥符号而不是点
Use key notation rather than dot
style["text-align"]
js中的所有数组都是对象，所有对象都只是关联数组，这意味着您可以引用对象中的某个位置，就像引用对象中的某个键一样。数组。
All arrays in js are objects and all objects are just associative arrays, this means you can refer to a place in an object just as you would refer to a key in an array.
arr[0]
或对象
obj["method"] == obj.method
以这种方式访问房产时要记住的几件事
a couple things to remember when accessing properties this way
-
对它们进行评估，因此除非您使用计数器或使用动态方法名称，否则请使用字符串。
they are evaluated so use strings unless you are doing something with a counter or using dynamic method names.
这意味着obj [会给你一个未定义的错误
而obj [method]不会
this means obj[method] would give you an undefined error while obj["method"] would not
你必须如果你使用的是js变量中不允许的字符，请使用这种表示法。
You must use this notation if you are using characters that are not allowed in js variables.
这个正则表达式几乎总结了它
This regex pretty much sums it up
[a-zA-Z_$][0-9a-zA-Z_$]*
这篇关于如何引用带有连字符的javascript对象属性？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
