js创建form表单提交

var postForm = document.createElement("form");
        postForm.method = "post";
          postForm.action = "XXXX";
          postForm.style = "display:none";
          var idInput = document.createElement("input");
          idInput.setAttribute("name", "id"); 
          idInput.setAttribute("value",12122);  
          postForm.appendChild(idInput);
          document.body.appendChild(postForm);
          postForm.submit();