本教程讲解javascript让元素居中显示
//控制logo的显示位置 Begin
window.addEventListener("resize", function () {
// 得到屏幕尺寸 (内部/外部宽度，内部/外部高度)
changeLogoPosition();
}, false);
changeLogoPosition();
function changeLogoPosition() {
var contentHeight = $("#main_content_div").css("height");
var logoHeight = $("#third_party_logo").css("height");
contentHeight = parseInt(contentHeight.replace('px', ''));
logoHeight = parseInt(logoHeight.replace('px', ''));
//alert('屏幕高度：'+document.body.scrollHeight+' 内容高度：'+contentHeight+' logo高度：'+logoHeight);
if (document.body.scrollHeight - contentHeight > logoHeight) {
document.getElementById('third_party_logo').style.position = 'absolute';
} else {
document.getElementById('third_party_logo').style.position = '';
}
}
//控制logo的显示位置 End
