我想做個(gè)一個(gè)隨著瀏覽器增加縮小，頁(yè)面自動(dòng)增加縮小的函數(shù)，請(qǐng)問(wèn)這段為什么不好使？

resizeWindow(id) {

        var baseWidth = 1920;

        var body = document.querySelector('body');
        var scale = document.querySelector('#app');
        function adaptiveScreen() {
            var per = body.clientWidth / baseWidth;
            scale.style.transform = 'scale(' + per + ')';
            scale.style.transformOrigin = 'left top';
        }

        var timeout = null;
        window.onresize = function () {
            clearTimeout(timeout);
            timeout = setTimeout(function () {
                adaptiveScreen();
            }, 400);
        };
        adaptiveScreen();

    }