<script>
var deviceWidth = document.documentElement.clientWidth;
if (deviceWidth >750)
deviceWidth =750;
document.documentElement.style.fontSize = deviceWidth /7.5 *0.4 +'px'; //参考值
</script>
字体 .7rem
<script>
var deviceWidth = document.documentElement.clientWidth;
if (deviceWidth >750)
deviceWidth =750;
document.documentElement.style.fontSize = deviceWidth /7.5 *0.4 +'px'; //参考值
</script>
字体 .7rem