web0331/7.移动端/rem.js

(function(win){
    var docEl = win.document.documentElement;
    var width = docEl.getBoundingClientRect().width;
    console.log(width,'kuann');
    var rem = width / 7.5;
    console.log(rem,'rem');
    docEl.style.fontSize = rem + 'px';

})(window);