<mt-header fixed title="洲峰电子">
        <span  slot="left"  class="back" style="font-size:1em" @click="back" v-show="flag" >
            <mt-button icon="back">返回</mt-button>
        </span>
   </mt-header>

export default {
  data() {
    return {
            flag:false
        };
  },
    watch: {
        "$route.path":function(newVal){
            //监听页面的路径  在home 页面下 ，隐藏返回按钮
                if(newVal==='/home'){
                    this.flag=false
                }else{
                        this.flag=true;
                }
        }
    },
  components: {}
};