$("#total_price").val($("#active_money").text());

 <button class=" btn btn-block btn_color" type="submit">预约</button>


<script>
$(function () {
    $("#total_price").val($("#active_money").text());
    var __formSubmit = false;
    $("form").on('submit',function () {
        //console.log($(this).serialize());
        if (__formSubmit) {
            return false;
        }

        __formSubmit = true;
        $.ajax({
            url: this.action,
            type: 'post',
            data:$(this).serialize(),
            dataType:"text",
            complete: function(XMLHttpRequest, textStatus) {
                console.log('complete_XML: '+XMLHttpRequest);
                console.log('complete_textStatus: '+textStatus);
            },
            error: function(xml,errStatus,errThrown){
                console.log('error_xml: '+xml);
                console.log('error_errStatus: '+errStatus);
                console.log('error_errThrown: '+errThrown);
            },
            success:function (res) {
                console.log(typeof(res));
                console.log(res);

            }
        });
        return false;
    })
})
</script>