后台系统更改主题【el-color-picker】-编程知识

后台系统更改主题【el-color-picker】

Element el-color-picker 颜色选择器的使用

设置的页面

<script setup lang="ts">
import { getThemeColor } from "../../utils/colorChange";
import { useUserStore } from "@/store/index";
import { reactive } from "vue";
import { ref } from "vue";
const userStore = useUserStore();const drawer = ref(false);
const handleClose = () => {drawer.value = false;colorCdt.color = "";
};
const openDrawer = (bool: boolean) => {drawer.value = bool;
};
const colorCdt = reactive({predefineColors: ["#ff4500","#ff8c00","#ffd700","#90ee90","#00ced1","#1e90ff","#c71585","rgba(255, 69, 0, 0.68)","rgb(255, 120, 0)","hsv(51, 100, 98)","hsva(120, 40, 94, 0.5)","hsl(181, 100%, 37%)","hsla(209, 100%, 56%, 0.73)","#c7158577",],color: "",isShowWaterMark: true,
});const changeTheme = (val: any) => {console.log(val, "val");document.documentElement.style.setProperty("--theme_bgColor", val); // 设置变量值sessionStorage.setItem("theme_bgColor", val); // 缓存存一份userStore.theme_bgColor = getThemeColor(); // vuex更新一下
};
defineExpose({ openDrawer });
</script>
<template><el-drawerv-model="drawer"title="设置":before-close="handleClose"size="20%"><div class="DrawItem"><span>主题更改：</span><el-color-picker@change="changeTheme"v-model="colorCdt.color"show-alpha:predefine="colorCdt.predefineColors"></el-color-picker></div></el-drawer>
</template><style lang="scss" >
.DrawItem {box-sizing: border-box;padding: 0 18px;display: flex;align-items: center;justify-content: space-around;justify-content: space-between;margin-bottom: 18px;font-size: 13px;font-weight: 600;
}
</style>

在这里插入图片描述
在store里面保存一个颜色变量值

在这里插入图片描述

获取主题颜色的方法写在colorChange.ts

// 获取主题颜色
export function getThemeColor() {// 有缓存用缓存，没缓存用默认let cache_theme_bgColor = sessionStorage.getItem("theme_bgColor");if (cache_theme_bgColor) {document.documentElement.style.setProperty("--theme_bgColor",cache_theme_bgColor);return cache_theme_bgColor;} else {let theme_bgColor = getComputedStyle(document.documentElement).getPropertyValue("--theme_bgColor");return theme_bgColor;}
}

:root定义全局样式和变量
定义 :root 后，所有变量都将被保存在 :root 中，并且可以在整个页面的任何位置使用。这使得我们可以轻松地为网站设置一些通用的变量，如颜色、字体、间距等等

reset.css【在main.ts里全局引入】