页面垂直居中（js实现）
页面垂直居中，登录之类的页面会用到，css似乎没办法实现，用js来做吧 var valgin = function(){ var height = window.innerHeight || window.document.documentElement.clientHeight || window.document.body.clientHeight; var t=$$('body')[0]; var top = (height - t.getHeight()) / 2; top = top>0 ? top : 0; t.setStyle({marginTop : top+'px'}); // t.setStyle({top:top+'px', 'position':'absolute'}); }; window.onload = valgin; window.onresize = valgin;