虽然通过搜索可以解决了，但是发现无法应用于本站上面！
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<html>
<head>
<style>
.div{
background:url(https://gdp.alicdn.com/imgextra/i1/66280588/TB2198VXp95V1Bjy0FfXXXvlFXa_!!66280588.jpg) no-repeat;
width:500px;
height:500px;
}
.div:hover{
background:url(https://gdp.alicdn.com/imgextra/i4/66280588/TB2o0vBtpXXXXcEXXXXXXXXXXXX_!!66280588.jpg) no-repeat;
display:block;
width:500px;
height:500px;
}
</style>
</head>
<body>
<div class=”div”></div>
</body>
</html>