【vue】过滤器 KB，MB单位转换(Vue)

<el-table-column label="文件大小" prop="FileSize">
  <template slot-scope="scope">
     <span>{{ scope.row.FileSize | filterType}}</span>
  </template>
</el-table-column>

filters:{
    filterType:function(val){
      if(val === 0) return "0 B"
        var k = 1024;
        var sizes = ['B','KB','MB','GB','PB','TB','EB','ZB','YB'],
        i = Math.floor(Math.log(val) / Math.log(k));
        return (val / Math.pow(k,i)).toPrecision(3) + "" + sizes[i]
 
    }
}