<style>
#el:-webkit-full-screen{
border: red solid 3px;
}
</style>
<div>
<img id="el" src="./img/mm1.jpg" alt="">
<button id="full">全屏显示</button>
</div>
<script>
document.querySelector("#full").onclick= function(){
var el = document.getElementById("el");
el.webkitRequestFullScreen()
}
</script>
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