Lokep.github.io/select.html at master · Lokep/Lokep.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,width=device-width,initial-scale=1.0"/>
	<title>select</title>
	<script>
		(function (doc, win) {
		    var docEl = doc.documentElement,
		        resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
		        recalc = function () {
		            var clientWidth = docEl.clientWidth;
		            if (!clientWidth) return;
		            if(clientWidth>=640){
		                docEl.style.fontSize = '100px';
		            }else{
		                docEl.style.fontSize = 100 * (clientWidth / 750) + 'px';
		            }
		        };

		    if (!doc.addEventListener) return;
		    win.addEventListener(resizeEvt, recalc, false);
		    doc.addEventListener('DOMContentLoaded', recalc, false);
		    console.log(docEl)
		})(document, window);
	</script>
	<style>
		*{
			margin: 0;
			padding:0;
		}
		select{
			display: block;
			-webkit-appearance:none;
			background-color: #fff;
			border-radius: 4px;
			width: 2rem;
			height: .4rem;
			margin: 2rem auto;
			border: 1px solid #999;
		}
	</style>
</head>
<body>
	<select>
		<option value="111">111</option>
		<option value="111">111</option>
		<option value="111">111</option>
		<option value="111">111</option>
		<option value="111">111</option>
	</select>
</body>
</html>