Question

移动端开发全部尺寸用rem有什么缺点

Answer 1

doc = win.document,
docElem = doc.documentElement,

vpMeta = doc.querySelector('meta[name="viewport"]'),
flexMeta = doc.querySelector('meta[name="flexible"]'),

dpr = 0,
scale = 0,

flexible = lib.flexible || (lib.flexible = {});

// 设置了 viewport meta
if (vpMeta) {

console.warn("将根据已有的meta标签来设置缩放比例");
var initial = vpMeta.getAttribute("content").match(/initial\-scale=([\d\.]+)/);

if (initial) {
scale = parseFloat(initial[1]); // 已设置的 initialScale
dpr = parseInt(1 / scale); // 设备像素比 devicePixelRatio
}