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/**
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* el-tree展开折叠控制
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* @param ref el-tree实例
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* @param action 'expand' | 'collapse'
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* @param level 展开的节点最大深度，为0时匹配全部节点
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* @param func 自定义展开的函数，传入一个node，返回boolean，优先使用
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*/
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export function expandControl(ref, action = 'expand', level = 1, func) {
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const handler = function () {
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if (typeof func === 'function') {
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return node => func(node)
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}
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const expand = action === 'expand'
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const forAll = level === 0
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return node => node.expanded = forAll || node.level <= level ? expand : !expand
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}()
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ref.store._getAllNodes().forEach(handler)
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}
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