说明业务:鼠标放到某个标签上,显示一个div,并跟随鼠标移动

html页面(直接放body里面):

      <a href="#" > 测试标签</span></a>

        <div class="" >测试框</div>

jQuer:

var tip={ 

  return document.getElementById(ele.toString());
  return null;
  },
  mousePos:function(e){
  var x,y;
  var e = e||window.event;
  return{ x:e.clientX+document.body.scrollLeft+document.documentElement.scrollLeft,
  y:e.clientY+document.body.scrollTop+document.documentElement.scrollTop};
  },
  start:function(obj){
  var self = this;
  obj.onmousemove=function(e){
  console.log(e)
  var mouse = self.mousePos(e);
  console.log(mouse)
  var left= mouse.x + 'px';
  var top= mouse.y + 'px';

  if(mouse.y+400>900){
  top=mouse.y-500+'px';
  }

};
}
}

 (没有太按语法结构来弄,但是主要代码都在上面)

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