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<!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>