动态创建form 完成form 提交

document.body.appendChild(jForm) won't work because jForm is not a dom element, it is a jQuery object so add the below script before jForm.submit();

jForm.appendTo('body')
function loadPage(url, projectName) {
var jForm = $('<form></form>', {
action: url,
method: 'post'
});

$("<input>", {
name: 'curPrj',
value: projectName
}).appendTo(jForm);

jForm.appendTo('body').submit();
}

var form = $("<form method='post'></form>"),
input;
form.attr({ "action": url });
$.each(args, function (key, value) {
input = $("<input type='hidden'>");
input.attr({ "name": key });
input.val(value);
form.append(input);
});
form.appendTo('body').submit();