1. Variables and their declarations 2. The scope of the scope of the variable and the life period of a variable is to refer to a piece of code that can reference this variable in the program. Since WMLScript only supports variables defined within a function, the role of WMLScript variables and usually defines the functions of them. In addition to this function, variables no longer play a direct role. 3. Variables of variables WMLScript can only be used within the defined function. A variable is required when using it.
4. Variable value of variables: The domain is equal to variables. 5. Various operators. Basically equivalent to other languages. Look, don't use it.
