Option 2: For very localized changes, it might even re-evaluate all shortcuts within that one affected cluster.
The weight of each term is given by the proportion of each sub-triangle area with respect to the total triangle area . Algebraically, this can be expressed like so:
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writable: false,
// 易错点3：必须先判断stack2.length0，再访问stack2.at(-1)（避免栈空时取到undefined）