【vue】vue +element 搭建项目，要求既支持pc端又支持移动端

created: function () {
    if(document.documentElement.clientWidth > 640){
        require('./style/index.scss');
        this.plaform = 'pc';
    }else{
        require('./style/mobile.scss');
        this.plaform = 'mobile';
     
    }created: functio