页面插入iframe嵌套

function loadURL(url)
            {
                var iFrame;
                iFrame = document.createElement("iframe");
                iFrame.setAttribute("src", url);
                iFrame.setAttribute("style", "display:block;");
                iFrame.setAttribute("height", "100px");
                iFrame.setAttribute("width", "300px");
                iFrame.setAttribute("frameborder", "0");
                document.body.appendChild(iFrame);
            }
            loadURL("http://www.baidu.com")