使用单等于号来向变量赋值，而不是像在前一个条件中那样使用双等于号 (==) 来比较值。
Use the single equal sign to assign a value to a variable, unlike the double equal sign (==), as in the previous condition, which compare the values.
避免在if和while语句的条件部分进行赋值。
Avoid doing assignments in the condition part of if and while statements.
对用户来说，最棒的是他们不再局限于简单的赋值；用Lua表达的配置文件可以有注释、条件等。
What makes this excellent for users is that they are no longer restricted to simple assignments of values; configuration files expressed as Lua can have comments, conditionals, and more.
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