当第一次进入页面时,可能由于网速或其他原因请求接口需要等待很长时间,这是页面一片空白,很难看,切交互性也不好,这是,我们常常放上一个loading等待图给用户以反馈
// 页面尚未加载时的loading图 var _PageHeight = document.documentElement.clientHeight, _PageWidth = document.documentElement.clientWidth; var _LoadingTop = _PageHeight > 61 ? (_PageHeight - 61) / 2 : 0, _LoadingLeft = _PageWidth > 215 ? (_PageWidth - 215) / 2 : 0; var _LoadingHtml = '<div id="loadingDiv" class="loadingDiv" style="position:absolute;left:0;100%;height:' + _PageHeight + 'px;top:0;background:#000;opacity:1;filter:alpha(opacity=80);z-index:10000;">'+ '<div style="position: absolute; cursor: wait; left: ' + _LoadingLeft + 'px; top:' + _LoadingTop + 'px; auto;padding:0 8px;background: #fff; font-size: 14px;" ><img style="50px;height:50px;display: inlin-block;" src="./style/img/load.gif"><span>页面加载中,请稍候...</span></div>'+ '</div>'; document.write(_LoadingHtml); document.onreadystatechange = completeLoading; function completeLoading() { if (document.readyState == "complete") { // debugger var loadingMask = document.getElementById('loadingDiv'); loadingMask.parentNode.removeChild(loadingMask); } }