移动端rem自适应布局关键代码

function resi() {
	var html = document.querySelector("html");
	var wW = document.body.clientWidth || document.documentElement.clientWidth;
	var maxW = 640;
	var minW = 320;
	if (wW > maxW) wW = maxW;
	var ratio = wW / minW;
	html.style.fontSize = 50 * ratio + "px"
}
window.addEventListener("DOMContentLoaded", function() {
	var bodys = document.querySelector("body").style;
	bodys.opacity = "1";
	bodys.filter = "alpha(opacity=100)";
	resi()
});
window.addEventListener("resize", resi);