<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> h1 { position: relative; /* 关键代码 实现折行效果 */ display: inline; padding-bottom: 2px; background-repeat: no-repeat; background-size: 0 2px; /* 控制线的位置 */ background-position: 50% 100%; /* 0% 100% 从左向右变动 */ /* 50% 100% 从中间往两侧 */ /* 100% 100% 从右向左变动 */ /* 0% 50% 可制作横穿线*/ -webkit-transition: all .5s ease-in-out; -moz-transition: all .5s ease-in-out; -o-transition: all .5s ease-in-out; transition: all .5s ease-in-out; /* 自己可以配置更多创意 */ background-image: linear-gradient(to right, #3344aa 0%, red 50%, #333 100%); } h1:hover { background-size: 100% 2px; } </style> </head> <body> <h1>很好的文章:JavaScript可变范围提升很好的文章:JavaScript可变范围提升很好的文章:JavaScript可变范</h1> </body> </html>