<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="Generator" content="EditPlus®"> <meta name="Author" content=""> <meta name="Keywords" content=""> <meta name="Description" content=""> <title>Document</title> <style> .box{ width: 200px; height: 20px; background:#ccc; border-radius:10px; position:relative } .clip{ position: absolute; width: 100%; height: 100%; clip: rect(0px,100px,20px,0px); /* 第二个参数为进度值，当前进度为50%，100%对应200px */ background: red; border-radius:10px; } </style> </head> <body> <div class='box'> <span class='clip'></span> </div> </body> </html>