我有一个contenteditablediv和几段.
这是我的代码:
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<div id="main" contenteditable="true"
style="border:solid 1px black; width:300px; height:300px">
<div>Hello world!</div>
<div>
<br>
</div>
<div>This is a paragraph</div>
</div>
</body>
</html>
假设,我想做一个范围选择,其中包含字符串"world!This is"
怎么做？