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                            1. 性能提升
2. composition API (組合api)
    + ref , reactive
    + computed, watch
    + 新的生命周期
    + Hooks
3. 其他
    + Teleport 瞬移組件
    + Suspense 異步加載組件
    + 全局 API 的修改和優化
4. 更好的 ts 支持

> 為什么會有 vue3
1. 隨著功能的增長，復雜的組件代碼變得難以維護
2. vue2 對 ts 的支持有限

3. 已經創建的實例，vue無法追蹤新屬性的響應式
4. 對于數組：通過索引無法新增響應式數據，vue2還推出了 Vue.set(obj, value, index)
5. vue3采用了 Proxy 實現了響應式



                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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