要相对于JavaScript的其余部分设置灵活项的顺序，请使用order属性。您可以尝试运行以下代码以实现order属性-
<!DOCTYPE html>
<html>
<head>
<style>
#box {
border: 1px solid #000000;
width: 420px;
height: 150px;
display: flex;
}
#box div {
height: 80px;
width: 80px;
}
</style>
</head>
<body>
<div id = "box">
<div style = "background-color:orange;" ID ="myID1">DIV1</div>
<div style = "background-color:blue;" id = "myID2">DIV2</div>
<div style = "background-color:yellow;" id = "myID3">DIV3</div>
</div>
<button onclick = "display()">Set</button>
<script>
function display() {
document.getElementById("myID1").style.order = "3";
document.getElementById("myID2").style.order = "1";
document.getElementById("myID3").style.order = "2";
}
</script>
</body>
</html>