var hello = document.createElement('<div>HELLO</div>');
var wrapper = document.getElementById('wrapper');
document.getElementsByTagName('span')[0].appendChild(hello);
wrapper.addEventListener('mouseover', mouseMove, false);
setTimeout(function(){
document.getElementsByTagName('span')[0].removeChild(hello);
wrapper .removeEventListener('mouseover', mouseMove, false);
}, 10000);
<div id="wrapper">
</div>
当我继续前进时 <div id="wrapper"></div>
结果为空
当我移动时如何在 10 秒<div id="wrapper"></div>
内显示结果HELLO
,如何解决它