使用columnRuleWidth属性设置列之间的宽度。您可以尝试运行以下代码以使用JavaScript设置列之间的规则宽度-
<!DOCTYPE html>
<html>
<head>
<style>
#myID {
column-count: 4;
column-rule: 4px solid yellow;
}
</style>
</head>
<body>
<p>Click below to change width</p>
<button onclick="display()">Change Width between Columns</button>
<div id="myID">
This is demo text. This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text. This is demo text.
This is demo text. This is demo text. This is demo text. This is demo text.
</div>
<script>
function display() {
document.getElementById("myID").style.columnRuleWidth = "8px";
}
</script>
</body>
</html>