mounted(){
      var that=this;
       var num = 1;
       var ss='';
     var a=setInterval(()=>{
       a+=10;
         if(this num===100){
           ss='success';
           console.log(ss)   
       			clearInterval(a)    //当num等于100时清除定时器
     } 
     }, 1000); 
   }