message: [bugfix] Tab: random insert order
diff: @@ -49,19 +49,19 @@ export default create({
  created() {
  this.findParent('van-tabs');
  + },
  + mounted() {
  const { tabs } = this.parent;
  const index = this.parent.$slots.default.indexOf(this.$vnode);
  tabs.splice(index === -1 ? tabs.length : index, 0, this);
  - },
  - mounted() {
  if (this.$slots.title) {
  this.parent.renderTitle(this.$refs.title, this.index);
  }
  },
  - destroyed() {
  + beforeDestroy() {
  this.parent.tabs.splice(this.index, 1);
  }
  });
  