tryjsref_onmouseenter_html 在线代码实例

 <p>该实例演示了如何向 h1 元素添加 "onmouseenter" 和 "onmouseleave" 事件。</p>
<h1 id="demo" onmouseenter="mouseEnter()" onmouseleave="mouseLeave()">鼠标移到我这</h1>
<script>
function mouseEnter() {
    document.getElementById("demo").style.color = "red";
}
function mouseLeave() {
    document.getElementById("demo").style.color = "black";
}
</script>