vue的背景加载--旋转*号

//加载动画开始
loadingStart(){
   this.loadingObj = this..$loading({
     lock:true,
     text:"数据请求中....",
     spinner：“el-icon-loading”,
     nackground:'rbga(0,0,0,0.3'
    })
}

//加载动画结束
loadingEnd(){
   this.loadingObj.close();
}