el-tree 树全部展开或收起

绑定属性expanded，树自带方法this.$refs.tree.store.root.expanded，在mounted方法中给树方法赋值expandAll = false，具体代码实现详情如下：

html代码：

<template>

      <el-tree
                  ref="tree"
                  :data="showDepData"
                  expand-on-click-node="false"
                  :props="{
                    label: 'name'
                  }"
                  node-key="deptId"
                  highlight-current
                  :default-expand-all="expanded"
                  @node-click="changeDepClick"
                >
                  <span slot-scope="{ node, data }">
                    <i
                      v-if="node.level == 1"
                      style="margin-right: 4px"
                      class="wk wk-customer"
                    />{{ data.name }}
                  </span>
                </el-tree>

</template

js代码：

data(){

return{
expanded:false
}

}

mounted(){
//获取树自带的属性并给他赋值false
this.$refs.store.root.expanded = expanded

}