rem缩放js

rem.js

// rem基准计算和限宽
(function(){
    function refreshRem() {
        document.documentElement.style.fontSize = (document.documentElement.clientWidth > 720 ? 720 : document.documentElement.clientWidth) / 18 + "px"
    }
    var tid = null;
    window.addEventListener("resize", function() {
        clearTimeout(tid);
        tid = setTimeout(refreshRem, 0);
    }, false);
    refreshRem();
})(window);