html5移动端禁止长按图片保存的实现

img{
   pointer-events:none;
}

{
   -webkit-touch-callout: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

<div class="imgbox">
    <div class="imshar"></div>
    <img src=""/>
</div>
<style>
 .imgbox{
    position: relative;
    width: 80%;
    margin: 0 auto;
    margin-: 20px;
}
 .imgbox .imshar{
    position: absolute;
    z-index: 100;
    left: 0;
    right: 0;
    : 0;
    bottom: 0;
    opacity: 0;
}
.imgbox img{
    display: block;
    width: 100%;
}
</style>