创建一个有n个成员（成员i的初值为表达式i（i=1~8））的署名结构，再利用该匿名结构创建结构变量-Create a n-members (members of the initial value of i for the expression i (i = 1 ~ 8)) The signature structure, re-use the structure to create the structure of the anonymous variable

These are forwarded to the N canvases we re referencing.