<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<script src="https://code.jquery.com/jquery-3.4.1.min.js" type="text/javascript" charset="utf-8"></script>
<body>
<div class=‘xz‘>
ssssssssssssssssssssssssss
ssssssssssssssssssssssssss
<div>
dddddddddddddddd
</div>
</div>
</body>
<script>
$(document).ready(function(){
$(".xz").hover(function(){
this.focus();
if(window.getSelection){
var range=document.createRange();
range.selectNodeContents(this);
var selection = window.getSelection();
selection.removeAllRanges();
selection.addRange(range)
}
else if(document.selection){
//for ie
var range=document.body.createTextRange()
range.moveToElementText(this)
range.select();
}
},function(){
if(window.getSelection){
var range=document.createRange();
range.selectNodeContents(this);
var selection = window.getSelection();
selection.removeAllRanges();
} else if(document.selection){
//for ie
var range=document.body.createTextRange()
range.moveToElementText(none)
}
});
});
</script>
</html>
原文：https://www.cnblogs.com/chengfengchi/p/11360394.html