自定义rem

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1, minimum-scale=1">

    <script type="text/javascript">

        if(document.documentElement.clientWidth < 750){

            document.documentElement.style.fontSize = document.documentElement.clientWidth / 640*32 + 'px';

            console.log(document.documentElement.clientWidth)

        }else{

            document.documentElement.style.fontSize = "16px";

        }

    </script>

</head>

<body>

<div>

    <span style="font-size:1rem;">danny.xie</span>

    <span style="font-size:16px;">danny.xie</span>

</div>

</body>

</html>
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