方法1：
<script type="text/javascript">
    var ua = navigator.userAgent;
    if (/Android (\d+\.\d+)/.test(ua)){
        <!-- 需要在頁面載入時候 生效 才能有效 -->
        var devicePixelRatio = window.devicePixelRatio;
        var deviceScale = 1/devicePixelRatio;
        document.write('<meta name="viewport" content="width=device-width,initial-scale='+deviceScale+',minimum-scale='+deviceScale+',maximum-scale='+deviceScale+',user-scalable=no">');
    }
</script>

方法2：

alert('BODY物件寬度'+document.body.clientWidth+'BODY物件高度'+document.body.clientHeight+'可見區域寬度'+document.documentElement.clientWidth+'可見區域高度'+document.documentElement.clientHeight)

$(window).resize(function () {
    var win = $(this).width();
    if (win < 1920) { //寬度小於時，按視窗實際寬度計算等比
        $("body").css("zoom", win / 1920);
    }else{
        $("body").css("zoom", "normal");
    }
}).trigger('resize');