js替换css主题变量并切换iconfont文件

iconfont不止有单色、双色的图标，还有很多【多色】的图标，于是不能【去色】，只能手动替换primary

新建一个iconfont，替换过主题色的，然后与旧的iconfont配合切换使用

主要如下：

reqiure之前必须【清除缓存】，否则无法生效，require加载机制如上图所示

const onChangeYellow = (index) => {
  if (appPrimary.value === "yellow") {
	// 重新设置主题色
    document
      .getElementsByClassName("skin-variant--semi-dark")[0]
      .style.setProperty("--v-primary-base", "#EDE20B");
    document
      .getElementsByClassName("v-main")[0]
      .style.setProperty("--v-primary-base", "#323232");

    vm.$vuetify.theme.themes.dark.primary = "#323232";

    // document.getElementsByTagName('html')[0].className = appPrimary.value
    document.documentElement.className = appPrimary.value;
	
	// 清除缓存
    delete require.cache[require.resolve("@/assets/yellow-iconfont/iconfont")];
    delete require.cache[
      require.resolve("@/assets/yellow-iconfont/iconfont.css")
    ];

	// 引入新的iconfont文件
    require("@/assets/yellow-iconfont/iconfont");
    require("@/assets/yellow-iconfont/iconfont.css");
  } else {
    document
      .getElementsByClassName("skin-variant--semi-dark")[0]
      .style.removeProperty("--v-primary-base");
    document
      .getElementsByClassName("v-main")[0]
      .style.removeProperty("--v-primary-base");

    // document.getElementsByTagName('html')[0].className = ''
    document.documentElement.className = "";

    // document.getElementsByClassName('yellow-iconfont')[0].remove()

    delete require.cache[require.resolve("@/assets/iconfont/iconfont")];
    delete require.cache[require.resolve("@/assets/iconfont/iconfont.css")];

    require("@/assets/iconfont/iconfont");
    require("@/assets/iconfont/iconfont.css");
  }
};