js实现QQ面板拖拽效果(慕课网DOM事件探秘)(全)

QQ面板拖拽,效果如图 JavaScript代码如下: function getByClass(clsName, parent) { var oParent = parent ? document.getElementById(parent) : document, eles = [], elements = oParent.getElementsByTagName('*'); for (var i = 0, l = elements.length; i < l; i++) { if (elements[i].className == clsName)