fix: keep `this` in parse expression function · alibaba/lowcode-engine@ce7e766

Member _scale should be declared before all constructor definitions

Member _contentWidth should be declared before all constructor definitions

Member _contentHeight should be declared before all constructor definitions

Member _scrollX should be declared before all constructor definitions

Member _scrollY should be declared before all constructor definitions

Member _scrollTarget should be declared before all constructor definitions

Member _scrolling should be declared before all constructor definitions

Member metadataTransducers should be declared before all constructor definitions

'i' is defined but never used

Member items should be declared before all method definitions

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