var panelMask = document.createElement('div');
panelMask.id = "loading-mask";
panelMask.className = "loading-mask";
document.getElementsByTagName("body").item(0).appendChild(panelMask);
var panel = document.createElement('div');
panel.id = "loading";
panel.className = "loading";
document.getElementsByTagName("body").item(0).appendChild(panel);
var image = document.createElement('div');
image.className = "image";
panel.appendChild(image);
var center = document.createElement('div');
center.className = "center";
center.innerHTML = "加载中...";
panel.appendChild(center);