javascript - offset() 未定义 'error'

Question

在加载页面时，我想获得面板的顶部。但它显示错误。在 Firefox 和 IE 中，它的说法是“offset() is undefined”，而在 Chrome 中，错误是“Uncaught TypeError: Cannot read property 'top' of undefined”。请帮忙。

$(window).resize(function () {
    tabPanelAdjust();
});

function tabPanelAdjust() {
    var theTabPanel = $(".TabPanel");
    var tabPanelTop = parseInt(theTabPanel.offset().top);
    var winHeight = $(document).height();
    tabPanelHeight = winHeight - tabPanelTop;
    theTabPanel.css({ "min-height": tabPanelHeight - 20 });
}

<div class="TabPanel">
</div>

Answer 1

代码没有问题。将您的代码包含在文档就绪方法中。可能是您的代码在加载 div 之前被触发。

$(function(){
$(window).resize(function () {
  tabPanelAdjust();
});

function tabPanelAdjust() {
 var theTabPanel = $(".TabPanel");
 var tabPanelTop = parseInt(theTabPanel.offset().top);
 var winHeight = $(document).height();
 tabPanelHeight = winHeight - tabPanelTop;
 theTabPanel.css({ "min-height": tabPanelHeight - 20 });
}
});

这是一个工作 fiddle :

http://jsfiddle.net/SX5U4/