一套 variable building block is used to set the value of a 变量. 变数 can be scoped to be available only in the same run of a case, across all cases in a run and even permanently for as long as the Project it is stored in exists.
见 使用数字和变量 lesson for examples on how to use 变量s.
完全扩展，集 variable block shows 以下属性：
标题中的绿色输入连接器用于触发块 start executing.
The green output connector in the header triggers when the 变量 has been saved.
The title of the block (“Set 变量”) can be changed by double-clicking on it and typing in a new title.
The name of the 变量. A 变量 name can contain any characters and it is case-sensitive.
The value of the 变量. Can contain tokens for field values (added below). Right-click and select “Insert token” to insert one or more field tokens.
Set the scope in which to load this 变量.
变数 of different scope are unique. This means that a 变量 named “test” with “Permanent” scope is not the same as a 变量 named “test” with “Only this case” scope.
更新 February 6th 2018