You use the function keyword to denote the start of a function and the var keyword to declare local (as opposed to global) variables, but you do not include the type of the variable being declared.

您可以使用function关键字开始函数的声明，使用var关键字来声明局部变量(这与全局变量不同)，但是不用包括正在声明的变量的类型。

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Both work fundamentally the same way, at compile time the keyword "var" is replaced with the correct scalar or array type for the associated expression.

二者的实现基础完全相同，即在编译时将“var”替换成为分析得到的正确的变量或数组类型表达式。

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Note that when the var and scope attributes are present, the type of data structure used by JSTL to represent the parsed document is implementation-specific, allowing for vendor optimization.

注意，当var和 scope 属性存在时，JSTL用于表示分解后的文件的数据结构类型以实施为导向，从而厂商可以对其进行优化。

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