若要设置轮廓颜色，请使用outlineColor属性。您可以尝试运行以下代码，以使用JavaScript设置元素周围的轮廓颜色：
<!DOCTYPE html>
<html>
<head>
<style>
#box {
width: 450px;
background-color: orange;
border: 3px solid red;
}
</style>
</head>
<body>
<p>Click below to add Outline Color.</p>
<div id="box">
<p>This is a div. This is a div. This is a div. This is a div. This is a div.</p>
<p>This is a div. This is a div. This is a div. This is a div. This is a div.</p>
<p>This is a div. This is a div. This is a div. This is a div. This is a div.</p>
</div>
<br>
<button type="button" onclick="display()">Set Outline Color</button>
<br>
<script>
function display() {
document.getElementById("box").style.outline = "thick solid";
document.getElementById("box").style.outlineColor = "#5F5F5F";
}
</script>
</body>
</html>