vue 寻任意组件实例（iview 源码）二七惨案
findComponentUpward
findComponentsUpward
国企备忘录>强捻纱由⼀个组件，向上到所有的指定组件；
findComponentDownward
由⼀个组件，向下到最近的指定组件；
findComponentsDownward
由⼀个组件，向下到所有指定的组件；
findBrothersComponents
由⼀个组件，到指定组件的兄弟组件// Find components upward function findComponentUpward (co
ntext , componentName , componentNames ) { if (typeof componentName === 'string') { componentNames = [componentName ]; } else { componentNames = componentName ; } let parent = context .$parent ; let name = parent .$options .name ; while (parent && (!name || componentNames .indexOf (name ) < 0)) { parent = parent .$parent ; if (parent ) name = parent .$options .name ; } return parent ;}export {findComponentUpward };// Find component downward export function findComponentDownward (context , componentName ) { const childrens = context .$children ; let children = null ; if (childrens .length ) { for (const child of childrens ) { const name = child .$options .name ; if (name === componentName ) { children = child ; break ; } else { children = findComponentDownward (child , componentName ); if (children ) break ; } } } return children ;}// Find components downward export function findComponentsDownward (context , componentName , ignoreComponentNames = []) { if (!Array .isArray (ignoreComponentNames )) { ignoreComponentNames = [ignoreComponentNames ]; } return context .$children .reduce ((components , child ) => { if (child .$options .name === componentName ) components .push (child ); if (ignoreComponentNames .indexOf (child .$options .name ) < 0) { const foundChilds = findComponentsDownward (child , componentName ); return components .concat (foundChilds ); } else { return components ;
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return components ; } }, []);}// Find components upward export function findComponentsUpward (context , componentName ) { let parents = []; const parent = context .$parent ; if (parent ) { if (parent .$options .name === componentName ) parents .push (parent ); return parents .concat (findComponentsUpward (parent , componentName )); } else { return []; }}// Find brothers components export function findBrothersComponents (context , componentName , exceptMe = true ) { let res = context .$parent .$children .filter (item => { return item .$options .name === componentName ; }); let index = res .findIndex (item => item ._uid === context ._uid ); if (exceptMe ) res .splice (index , 1); return res ;}5051525354
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