浏览器中模拟mouseenter omouseleave事件(解决onmouseover onmouseout重复调用)
一. mouseenter和mouseleave何时被触发我们来看下官方解释(mouseenter，mouseleave)：// onmouseenter：Fires when the user moves the mouse pointer inside the boundaries of an object.即：当鼠标移入元素对象的边界之内时，激活该事件// onmousele...
