(function (win) {
    var timer;
    function refreshRem() {
        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';
    }
    console.log("走进来")
    win.addEventListener('resize',function() {
        console.log("监听")
       clearTimeout(timer);
       timer =  setTimeout(refreshRem,10)
    },false);
    refreshRem()

})(window);