<style>

a:focus, a:active {

    color: green;

}

</style>

<a id="myAnchor" href="https://www.twle.cn">访问简单教程</a>

<p>点击按钮设置或移除以上链接的焦点</p>

<input type="button" onclick="getfocus()" value="获取焦点">

<input type="button" onclick="losefocus()" value="移除焦点">

<script>

function getfocus() {

    document.getElementById("myAnchor").focus();

}

function losefocus() {

    document.getElementById("myAnchor").blur();

}

</script>

​