JQuery鼠标移到小图显示大图效果的方法

//创建 div 元素 图片提示
var tooltip = "<div id="tooltip"><img src="&quot;+ this.href +&quot;" alt="预览图"><\/div>"; 
</div>

this.myTitle = this.title; 
this.title = "";  
var imgTitle = this.myTitle? "<br />" + this.myTitle : "";

// 创建 div 元素
var tooltip = "<div id='tooltip'><img src='"+ this.href +"' alt='产品预览图'/>"+imgTitle+"<\/div>"; 

var imgTitle; 
if (this.myTitle) { 
  imgTitle = "<br />" + this.myTitle; 
} else { 
  imgTitle = ""; 
}

<script type="text/javascript">
//<![CDATA[
$(function(){
  var x = 10;
  var y = 20;
  $("a.tooltip").mouseover(function(e){
    this.myTitle = this.title;
    this.title = "";  
    var imgTitle = this.myTitle? "<br/>" + this.myTitle : "";
    var tooltip = "<div id='tooltip'><img src='"+ this.href +"' alt='预览图'/>"+imgTitle+"<\/div>";
    //创建 div 元素
    $("body").append(tooltip);
    //把它追加到文档中             
    $("#tooltip")
      .css({
        "top": (e.pageY+y) + "px",
        "left": (e.pageX+x) + "px"
      }).show("fast"); //设置x坐标和y坐标，并且显示
 }).mouseout(function(){
    this.title = this.myTitle;  
    $("#tooltip").remove(); //移除 
 }).mousemove(function(e){
    $("#tooltip")
      .css({
        "top": (e.pageY+y) + "px",
        "left": (e.pageX+x) + "px"
      });
  });
})
//]]>
</script>