在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>菜鸟教程(cainiaoplay.com)</title>
<style>#myDIV{
	width:150px;
	height:100px;
	background-color:lightblue;
	border:1px solid black;
}
</style>
</head>
<body>

<p>点击“尝试一下”按钮，让 DIV 元素在任意两个字母之间断行：</p>
<div id="myDIV">Thiscouldbeaninsainlylargeword</div>
<button onclick="myFunction()">尝试一下</button>
<script>
function myFunction(){
	document.getElementById("myDIV").style.wordBreak = "break-all";
}
</script>

</body>
</html>
源代码

动行结果
