UniApp微信小程序线性渐变失效及导航栏滚动变色方案

background-image:linear-gradient(to right, #33f38d8a,#6dd5ed00); 

background-image:linear-gradient(90deg, #33f38d8a 30%, #6dd5ed00 100%)

export default {
  data() {
    return {
      navBgColor: "rgba(0,0,0,0)", // 初始背景颜色为完全透明
      navTextColor: "rgba(0,0,0,1)", // 初始文字颜色
    };
  },
  onPageScroll(e) {
    // 设置背景
    const newAlpha = Math.min((e.scrollTop / 100) * 1, 1);
    this.navBgColor = `rgba(${this.shadeBackground},${newAlpha})`;
    // 设置文字
    const progress = Math.min(e.scrollTop, 255) / 255;
    const [r, g, b] = this.shadeTextColor.split(",").map(Number);
    const newTextRgb = Math.min(e.scrollTop * 5, 255);
    const newRgb = [r, g, b].map((targetValue) => {
      return Math.min(newTextRgb + (targetValue - newTextRgb) * progress, 255);
    });
    this.navTextColor = `rgba(${newRgb.join()},1)`;
  },
};

import activityScrollTop from "../../js/activityScrollTop";
export default {
  mixins: [activityScrollTop],
}

<uni-nav-bar
  :leftIcon="图标"
  :border="false"
  @clickLeft="方法名"
  :backgroundColor="navBgColor"
  fixed
  statusBar
  :color="navTextColor"
  title="活动详情"
></uni-nav-bar>

// 渐变导航背景颜色
shadeBackground: "254,181,89",
// 渐变导航的文字颜色
shadeTextColor: "255,255,255",