如果设备宽度小于1024,跳转到手机端网站

<script>
    function jumpIfMobile() {
        //判断是移动设备 且 宽度小于1024 后跳转到m站
        if ( window.innerWidth <= 1024 && navigator.userAgent.match(/(Android|iPhone|SymbianOS|Windows Phone|iPad|iPod)/i)) {
            var url = location.protocol + "//" + location.host.replace("www.", "m.") + location.pathname
            if (location.search) {
                if (/source=m_jump/.test(location.search)) {
                    url += location.search.replace("source=m_jump", "source=pc_jump")
                } else if (/source=pc_jump/.test(location.search)) {
                    url += location.search
                } else {
                    url += (location.search + "&source=pc_jump")
                }
            } else {
                url += "?source=pc_jump"
            }
            window.addEventListener('load', function () {
                setTimeout(function () {
                    window.location.href = url;
                }, 1000)
            })
        }
    }
    jumpIfMobile();
</script>