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                            [TOC]
*****
## 5 ref.js  ref指令

>[info] import
~~~
;(導入)添加hook助手
import { addHook } from '../helpers'
~~~
>[info] module
~~~
export function ref (el, dir) {
  ;是否在v-for中
  let isFor = false
  let parent = el
  while (parent) {
    if (parent.for !== undefined) {
      isFor = true
    }
    parent = parent.parent
  }
  
  ;生成引用代碼__registerRef__(name, ref, vFor?, remove?)
  const code = `__registerRef__("${dir.arg}", n1.child || n1.elm, ${isFor ? 'true' : 'false'}`
  
  ;注冊與銷毀鉤子
  addHook(el, 'insert', `${code})`)
  addHook(el, 'destroy', `${code}, true)`)
}
~~~
>[info] export
~~~
;(導出)引用管理接口
export function ref (el, dir) {}
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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