外部如何导入模拟的数据json

https://blog.csdn.net/CherryLee_1210/article/details/102939724?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param

如何让黑色背景全覆盖

  position: absolute;

  top: 0;

  left: 0;

  right: 0;

  bottom: 0;

  //   height: 100%;

  border: blue solid 1px;