console
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>flex布局</title>
<style>
#main {
width: 220px;
height: 300px;
border: 1px solid black;
display: flex;
}
</style>
</head>
<body>
<div>
align-items:
<label><input type="radio" name="align-items" value="flex-start">flex-start</label>
<label><input type="radio" name="align-items" value="flex-end">flex-end</label>
<label><input type="radio" name="align-items" value="stretch">stretch</label>
<label><input type="radio" name="align-items" value="center">center</label>
</div>
<div id="main">
<div style="background-color:coral;">RED</div>
<div style="background-color:lightblue;">BLUE</div>
<div style="background-color:lightgreen;">Green div with more content.</div>
</div>
</body>
<script>
$("input[name='align-items']").on("click", function(){
$("#main").css("align-items", $(this).val());
});
</script>
</html>