<div class="tip" ref="tipRef" :style="{'top':top + 'px','left':left + 'px'}"> </div>

const top = ref(0);

const left = ref(0);

const maxTop = ref(0);

const maxLeft = ref(0);

const stepX = ref(1);

const stepY = ref(1);

const timer = ref("") as any

const tipRef = ref()

const dasdasd = () => {

  maxTop.value = document.documentElement.clientHeight - 290

  maxLeft.value = document.documentElement.clientWidth - 190

  timer.value = setInterval(() => {

    if (top.value >= maxTop.value || top.value < 0) {

        stepY.value = -stepY.value

      }

      if (left.value >= maxLeft.value || left.value < 0) {

        stepX.value = -stepX.value

      }

      top.value += stepY.value

      left.value += stepX.value

  }, 10)

}

.tip {

  width: 300px;

  height: 300px;

  background-color: red;

  position: fixed;

  top: 0;

  left: 0;

  z-index: 999;

}