关于iframe跨域POST提交的方法示例

<form action="You POST Link" method="post" target="target" id="J_commenting">
 <select name="category" class="select J_filter" id="J_typeFilter">
 <option value="0" selected="selected">Select Category</option>
 <option value="1">Life</option>
 <option value="2">People</option>
 <option value="3">Landscape</option>
 <option value="4">Tech</option>
 <option value="5">Others</option>
 </select>
 <input name="title" type="text" class="misstion-title J_misstion-title">
 <textarea name="desc" class="misstion-description J_description" maxlength="200"></textarea>
 <button class="button J_button" type="submit">Submit</button>
</form>
<iframe name="target" style="display:none;"></iframe>

var $button = $('.J_button');
var $commenting = $('#J_commenting');
var $filter = $('.J_filter');
var $misstionTitle = $('.J_misstion-title');
var $description = $('.J_description');
$button.on('click', function () {
 var filterValue = $filter.val();
 var misstionTitleValue = $misstionTitle.val();
 var descriptionValue = $description.val();
 if (filterValue === '0' || misstionTitleValue === '' || descriptionValue === '') {
 alert('Check if you filled out all the fields required');
 } else {
 $commenting.submit();
 }
});
$commenting.on('submit', function () {
 document.domain = 'aa.com';
 window.addData = function (data) {
 var dataCode = data.code;
 var dataMsg = data.message;
 if (dataCode === 0) {
  alert('submit success!');
 } else {
  alert('submit failed!');
 }
 }
});

document.domain = "aa.com";
var data = {"code":-2,"info":"please login first","message":"please login first"}; 
if( typeof(parent.window['addData']) == "function"){
 parent.window['addData'](data);
}else if( typeof(window.top['addData']) == "function"){
 window.top['addData'](data);
}