//鼠标位置存储
var mouseInfo={x:0,y:0};
//指示框定位
var setTipboxPosition=function(e){
mouseInfo.x=e.pageX;
mouseInfo.y=e.pageY;
$tipbox.css({
top:mouseInfo.y<thumbInfo.width/2+thumbInfo.top
?Math.max(mouseInfo.y-tipboxInfo.height/2,thumbInfo.top)
:Math.min(mouseInfo.y-tipboxInfo.height/2,thumbInfo.top+thumbInfo.height-tipboxInfo.height),
left:mouseInfo.x<thumbInfo.width/2+thumbInfo.left
?Math.max(mouseInfo.x-tipboxInfo.width/2,thumbInfo.left)
:Math.min(mouseInfo.x-tipboxInfo.width/2,thumbInfo.left+thumbInfo.width-tipboxInfo.width)
});
setImgPosition();
};
随便一提，如果有一种浏览器，也许会很幸运。
演示代码
打包下载 //www.jb51.net/jiaoben/22866.html
