【轉】頁面加載等待頁面JS

加到Header下面便可

//獲取瀏覽器頁面可見高度和寬度
var _PageHeight = document.documentElement.clientHeight,
_PageWidth = document.documentElement.clientWidth;
//計算loading框距離頂部和左部的距離（loading框的寬度爲215px，高度爲61px）
var _LoadingTop = _PageHeight > 61 ? (_PageHeight - 61) / 2 : 0,
_LoadingLeft = _PageWidth > 215 ? (_PageWidth - 215) / 2 : 0;
//在頁面未加載完畢以前顯示的loading Html自定義內容
var _LoadingHtml = '<div id="loadingDiv" style="position:absolute;left:0;width:100%;height:' + _PageHeight + 'px;top:0;background:#f3f8ff;opacity:0.8;filter:alpha(opacity=80);z-index:10000;overflow:hidden"><div style="position: absolute; cursor1: wait; left: ' + _LoadingLeft + 'px; top:' + _LoadingTop + 'px; width: auto; height: 57px; line-height: 57px; padding-left: 50px; padding-right: 5px; background: #fff url(/images/pageloading.gif) no-repeat scroll 5px 10px; border: 2px solid #95B8E7; color: #696969; font-family:\'Microsoft YaHei\';">頁面加載中，請等待...</div></div>';
//呈現loading效果
document.write(_LoadingHtml);

//window.onload = function () {
// var loadingMask = document.getElementById('loadingDiv');
// loadingMask.parentNode.removeChild(loadingMask);
//};

//監聽加載狀態改變
document.onreadystatechange = completeLoading;

//加載狀態爲complete時移除loading效果
function completeLoading() {
if (document.readyState == "complete") {
var loadingMask = document.getElementById('loadingDiv');
loadingMask.parentNode.removeChild(loadingMask);
}
}