当鼠标移入移出div时，触发事件（此处为图片的可见和不可见）

<div οnmοuseοver='showDel(this)' οnmοuseοut='hideDel(this)' class='selector"
+ quesNum
+ " selector-style'><input type='radio'  name='S"
+ quesNum
+ "'><input type='text'  placeholder='选项'  class='ST"
+ quesNum
+ "'><image id='"
+ quesNum
+ "' style='width:10px;height:10px;margin-left:10px;cursor:pointer;visibility:hidden'  src='img/addsel.png'  alt='添加' οnclick='addSelector(this)' ><image class='image"
+ quesNum
+ "' name='image"
+ quesNum
+ "' style='width:10px;height:10px;margin-left:10px;cursor:pointer;visibility:hidden'  src='img/delsel.gif'  alt='删除' οnclick='delSelector(this)' ></div>

function showDel(obj) {

$(obj).find("img").css('visibility', 'visible');
}


function hideDel(obj) {
$(obj).find("img").css('visibility', 'hidden');
}

来源：CSDN

作者：追梦的小猴子

链接：https://blog.csdn.net/zhangqun23/article/details/52148743