Variables are always assigned by value, which means that when one variable is set equal to another variable, they are then independent of each other.

变量始终是由值指定的，这意味着设置一个变量等于另一个变量后，它们就相互独立。

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Many attributes have default values, but only the required attribute must be assigned a value.

许多属性具有缺省值，但只有必需属性必须分配值。

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Variable @variable assigned but value never used.

变量@variable已分配但其值从未使用

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