添加边框 border:1px solid green;
强制不允许换行 white-space:nowrap;
强制换行,内容到边才允许换行 word-dreak:break-all;
以单词长度,选择换行,默认 break-word
word-break:break-word;
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Title</title>
<meta name="Keywords" content="关键字">
<meta name="description" content="简介">
<!-- 添加边框 border: 1px sol