elementui ztree 编辑的时候，回显半选状态的选项，用isLeaf判断

  this.$nextTick(() => {

            for(let i=data.menuIds.length-1;i>=0;i--){

              //  console.log("--id--",data.menuIds[i])

              //  console.log("----",this.$refs.tree.getNode(data.menuIds[i]))

              //  console.log("----",this.$refs.tree.getNode(data.menuIds[i]).isLeaf)

               let isleaf = this.$refs.tree.getNode(data.menuIds[i]).isLeaf 

               if(isleaf){

                //  console.log("data.menuIds[i]----",data.menuIds[i])

                 yesLeafArray.push(data.menuIds[i])

               }

            }

            // console.log("yesLeafArray",yesLeafArray)

            this.$refs.tree.setCheckedKeys(yesLeafArray || [], true);

          });