<html><head><style>#grad1 { height: 150px; width: 200px; background-color: red; /* 针对不支持渐变的浏览器 */ background-image: radial-gradient(red, yellow, green);}</style></head><body><h1>径向渐变 - 均匀间隔的色标</h1><div id="grad1"></div></body></html>