方法一(有缺陷)：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Examples</title>
<style>
.num1{-webkit-text-stroke: 0.4px red;
}</style>
</head>
<body><div class="num1">测试</div>
</body>
</html>
方法二(普遍适用,但麻烦)：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Examples</title>
<style>
.num1{position: absolute;-webkit-text-stroke: 2px red;top: 0;left: 0;z-index: 3;
}
.num2{position: absolute;top: 0;left: 0;z-index: 99;
}</style>
</head>
<body><div class="num1">测试</div><div class="num2">测试</div>
</body>
</html>
