We are going to cover what constitutes a variable, and the reasoning behind camelCase.
A variable, also referred to as 'var', is the name or placeholder for a boolean, string, number, or other piece of static information.
You can use Google Dev Tools to inspect the Free Code Camp home page and look for some variables.
You 'declare' variables the first time with 'var' in front of it, but those can be referenced later in your script.
When you name variables, utilize camelCase. Also try to keep the names descriptive and short so that others (and yourself!) can tell what that variable is referring to just by the name.
接下来我们会讲到 变量 和 骆驼拼写法
当你明明变量的时候， 使用 骆驼拼写法。 并且让变量的命名尽可能的具有描述性和尽可能短，这样别人（还有你）才可以根据名字来判断一个变量是什么