Zho:变数 () 改变 ()（积木）

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变数 () 改变 ()
變數 [ v] 改變 (1)
类别	变量类积木
形狀	条形积木

The Change () by () 积木 is a 变量类积木 and a 条形积木. The block will change the specified 变量 by a given amount. If the variable is a 字串 and not a number, it is set to the quantity the variable was to be changed by (转换 the string to 0).

Prior to Scratch 1.3, this block did not have a drop-down input listing the variables and instead there was an instance of it for each variable.

用法示例

Some common uses for the Change () by () block:

• Changing the speed of an object

變數 [speed v] 設為 (2)
x 設為 (-240)
重複無限次 
  x 改變 (speed)
  變數 [speed v] 改變 (1)
  說出 [Whee!!!]
end

• Changing a level number

如果 <碰到 [goal v] ?> 那麼 
  變數 [level v] 改變 (1)
end

• Changing the score in a game

如果 <碰到 [laser v] ?> 那麼 
  變數 [score v] 改變 (-5)
end

应用

Main article: List of Block Workarounds

This block can be replaced by the following script:

變數 [variable v] 設為 ((variable) + (amount))

The blank space at the far right contains the number that will change the value —a positive number to increase and a negative number to decrease the variable.

参见

• 变数 () 设为 ()