SOURCE

function cursor(event) {
  document.getElementById('trail').style.visibility ="visible";
  document.getElementById('trail').style.position = "absolute";
  document.getElementById('trail').style.left = event.clientX + 10+'px';
  document.getElementById('trail').style.top = event.clientY+'px';
}

<h1 onmousemove="cursor(event)" onmouseout="document.getElementById('trail').style.visibility ='hidden'">
  移动鼠标
</h1>
<span id="trail" class="trail">
  指针文本
</span>

.trail {
    visibility: hidden;
    font-size: 14px;
    color: aquamarine;
    font-weight: bold; 
    cursor: pointer;
}