获取隐藏的字段值

var hiddenFieldValue = document.getElementById("hiddenFieldId").value;

var hiddenFieldValue = $("#hiddenFieldId").val();

$.ajax({
    url: "your_url_here",
    type: "POST",
    data: {
        hiddenFieldName: $("#hiddenFieldId").val()
    },
    success: function(response) {
        // 处理响应
    },
    error: function(xhr, status, error) {
        // 处理错误
    }
});

$hiddenFieldValue = $_POST["hiddenFieldName"];

hiddenFieldValue = request.form.get("hiddenFieldName")