vue3源码

向右看齐 2022-09-02 11:35 178阅读 0赞

# reactive![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70] #

## createReactiveObject ##

其实就是个proxy

function createReactiveObject(
      target: Target, isReadonly: boolean, baseHandlers: ProxyHandler<any>, collectionHandlers: ProxyHandler<any>
    ) { 
      if (!isObject(target)) { 
        if (__DEV__) { 
          console.warn(`value cannot be made reactive: ${ String(target)}`)
        }
        return target
      }
      // target is already a Proxy, return it.
      // exception: calling readonly() on a reactive object
      if (
        target[ReactiveFlags.RAW] &&
        !(isReadonly && target[ReactiveFlags.IS_REACTIVE])
      ) { 
        return target
      }
      // target already has corresponding Proxy
      const proxyMap = isReadonly ? readonlyMap : reactiveMap
      // 如果map里面有就直接返回 提高性能
      const existingProxy = proxyMap.get(target)
      if (existingProxy) { 
        return existingProxy
      }
      // only a whitelist of value types can be observed.
      const targetType = getTargetType(target)
      if (targetType === TargetType.INVALID) { 
        return target
      }
      const proxy = new Proxy(
        target,
        targetType === TargetType.COLLECTION ? collectionHandlers : baseHandlers
      )
      proxyMap.set(target, proxy)
      return proxy
    }

遇到看不懂的部分打个debugger看  
![在这里插入图片描述][2032813135694051992e649060088d1a.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 1]

## proxy中的handler ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 2]  
拿到state中的name属性，进行跟踪，发生变化后会重新出发render函数  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 4]  
调试get函数过程  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 5]  
如果属性是ref对象会被接触ref  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 6]

![在这里插入图片描述][a8678d7ce0254d4d8fcb6d5e17538820.png]

## set ##

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70]: /images/20220829/2ae5172bf15d4a10a3035f57d3cb735d.png
[2032813135694051992e649060088d1a.png]: /images/20220829/60f70c9d12fc4e3c8b056413aca4ebc6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 1]: /images/20220829/8569bd3c075b496da88338bcb9c62700.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 2]: /images/20220829/3ad8d2de13044a2fa4e94b51ca5c5075.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 3]: /images/20220829/4f8a0f8967114795a735bff9e4298525.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 4]: /images/20220829/acc0f212fdfb4ceca48ee0dceb079cc6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 5]: /images/20220829/d8be3ccbcef44c1d8ffd6ced1e436a70.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTM0NTEwNQ_size_16_color_FFFFFF_t_70 6]: /images/20220829/766e19fbf733407d8634f65fd8d04a4b.png
[a8678d7ce0254d4d8fcb6d5e17538820.png]: /images/20220829/bda989de84ca4df5bb00d3f55c7fe505.png