get提交转为post提交

//把get提交转化为post提交 利用了iframe跟form
   function PostNewWin(url,data){
   
    var iframe = document.getElementById("postData_iframe");
    if(!iframe){
    
     iframe = document.createElement("iframe");
     iframe.id = "postData_iframe";
     iframe.name = "postData_iframe";
     iframe.src= "about:blank";
     iframe.style.width = "0px";
     iframe.style.height = "0px";
     
     document.body.appendChild(iframe);
     var html = '<form action="'+url+'" method="post" target="_parent" id="postData_form"> <input name="postData" id="postData" name ="postData" type="text" value="'+data+'"/></form>';
     iframe.contentWindow.document.write(html);
     //window.opener=null;关闭当前窗口，不需要询问关闭提示
     //window.close();
     iframe.contentWindow.document.getElementById("postData_form").submit(); 
    }
    
   }