css代码:
#loadingDiv{position:absolute;left:0;width:100%;top:0;background:#fff;z-index:10000} #loadingDiv div{position:absolute;width:auto;height:105px;padding-left:215px;background:#fff url(../images/loading.gif) no-repeat center center/50px 50px}
js代码:
var _PageHeight = document.documentElement.clientHeight, _PageWidth = document.documentElement.clientWidth; //计算loading框距离顶部和左部的距离(loading框的宽度为215px,高度为61px) var _LoadingTop = _PageHeight > 61 ? (_PageHeight - 61) / 2 : 0, _LoadingLeft = _PageWidth > 215 ? (_PageWidth - 215) / 2 : 0; //在页面未加载完毕之前显示的loading Html自定义内容 var _LoadingHtml = '<div id="loadingDiv" style="height:' + _PageHeight + 'px;"><div style="left: ' + _LoadingLeft + 'px; top:' + _LoadingTop + 'px;"></div></div>'; //呈现loading效果 document.write(_LoadingHtml); //监听加载状态改变 document.onreadystatechange = completeLoading; //加载状态为complete时移除loading效果 function completeLoading() { if (document.readyState == "complete") { var loadingMask = document.getElementById('loadingDiv'); loadingMask.parentNode.removeChild(loadingMask); } }
就是如此简单,赶快试试吧!
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