在vue中实现点击选择框阻止弹出层消失的方法

<div class="sex" v-show="showed" transition='fade' @click="unshow">
        <ul @click.s="shidden">
          <li class="choice">选择</li>
          <li>
            <label>男</label>
            <input type="radio" name="sex" value="男">
          </li>
          <li>
            <label>女</label>
            <input type="radio" name="sex" value="女">
          </li>
        </ul>
      </div>

<ul @click.s="shidden">

 <ul @click.s="">

<div class="collect" @click="checktanchuceng">
  <button @click="unshow">toggle</button>
  <div class="tachuceng" v-show="showed">

  </div>
</div>
<script>
export default {
  data (){
    return {
      showed:false
    }
  },
  methods:{
    checktanchuceng (){
      if(this.showed=true){
        this.showed=false;
      }
    },
    unshow(){
      this.showed=!this.showed
    }
  }
}
</script>

<button @click.s="unshow">toggle</button>