Vue.prototype.$ajax=axios; 
const CancelToken = axios.CancelToken;
let cancel;
let cancelAjaxText = '中斷成功';
Vue.prototype.post = function(url,data,loading){
 	var ajax = Vue.prototype.$ajax({
	   	method: 'post',
	   	url:url,
	   	data: data,
	   	cancelToken: new CancelToken(c => { //強行中斷請求要用到的
	   	cancel = c
	   	})
	  }).then(res =>res.data,res=>{ //中斷請求和請求出錯都會走這里，我這里用 cancelAjaxText 來區(qū)別
	  	if(res.message == cancelAjaxText){ 
	  		return {status : false,msg:cancelAjaxText}
	  	}else{
	  		this.$confirm('登錄過時，是否重新登錄', '提示', {
			   	confirmButtonText: '確定',
			   	cancelButtonText: '取消',
			   	type: 'warning'
			  }).then(() => {
			   	window.location.href = Vue.prototype.url_head + '/';
			  }).catch(() => {
			   	  
			  });
	  	}
		 		 	
			})
 	return ajax;
};

Vue.prototype.cancelAjax = function(){ //切換頁面強行中斷請求 router.beforeEach中用到 
 if(cancel){ 
  cancel(cancelAjaxText); 
 } 
} 

router.beforeEach((to, from, next) => { 
<span style="white-space:pre;"> </span>Vue.prototype.cancelAjax()  
 next(); 
}); 

<span style="white-space:pre;">   </span>this.post(this.ajaxUrl + 'getCrTree',{ 
    devAddr : this.changeData.devAddr, 
    innerId : this.changeData.innerId, 
   }).then(ret=>{ 
    if(ret.status){ 
      
    }else{ 
     this.msg(ret.msg); 
    } 
   })