如果bgObj有width属性的话
<div id="bgObj" style="width:?px;left:?px;top:?px;heigth:?px">显示在鼠标的右方</div>var bgObj = document.getElementById("cover");
bgObj.style.left= mousePos.x-bgObj.style.width;
bgObj.style.top=mousePos.y;
<div id="bgObj" style="width:?px;left:?px;top:?px;heigth:?px">显示在鼠标的右方</div>var bgObj = document.getElementById("cover");
bgObj.style.left= mousePos.x-bgObj.style.width;
bgObj.style.top=mousePos.y;
bgObj.style.left= mousePos.x-bgObj.style.width;
=====>
bgObj.style.left= mousePos.x-bgObj.style.width.substring(0,bgObj.style.vidth.length-2);