$().ready(function() {
    $("#searchbtn").click(function() {
        var value = $("#searchtxt").val();

        if (value == "") {
            alert("请输入查询文字");
        }
        else {
            var url = "result.shtml?query=" + value;
            url = encodeURI(url)
            window.location.href = url;
        }
    });

    $("body").keypress(function(event) {
        if (event.keyCode == 13) {
            $("#searchbtn").click();
            return false;
        }
    });
})