From bd2f187c3f6e24576919e71c794cf8cb9f8c8bac Mon Sep 17 00:00:00 2001
From: loulijun2021 <1694218219@qq.com>
Date: 星期四, 29 十二月 2022 11:21:41 +0800
Subject: [PATCH] 1.初级实现项目换肤功能

---
 src/styles/element-variables.scss        |   31 ++
 src/components/RightPanel/index.vue      |  145 ++++++++++
 src/layout/index.vue                     |   79 +++--
 src/settings.js                          |   13 
 src/layout/components/index.js           |    1 
 src/components/ThemePicker/index.vue     |  175 ++++++++++++
 src/utils/index.js                       |  240 +++++++++++++++++
 src/layout/components/Settings/index.vue |  109 +++++++
 src/store/modules/settings.js            |    2 
 9 files changed, 760 insertions(+), 35 deletions(-)

diff --git a/src/components/RightPanel/index.vue b/src/components/RightPanel/index.vue
new file mode 100644
index 0000000..55e8c1e
--- /dev/null
+++ b/src/components/RightPanel/index.vue
@@ -0,0 +1,145 @@
+<template>
+  <div ref="rightPanel" :class="{show:show}" class="rightPanel-container">
+    <div class="rightPanel-background" />
+    <div class="rightPanel">
+      <div class="handle-button" :style="{'top':buttonTop+'px','background-color':theme}" @click="show=!show">
+        <i :class="show?'el-icon-close':'el-icon-setting'" />
+      </div>
+      <div class="rightPanel-items">
+        <slot />
+      </div>
+    </div>
+  </div>
+</template>
+
+<script>
+import { addClass, removeClass } from '@/utils'
+
+export default {
+  name: 'RightPanel',
+  props: {
+    clickNotClose: {
+      default: false,
+      type: Boolean
+    },
+    buttonTop: {
+      default: 250,
+      type: Number
+    }
+  },
+  data() {
+    return {
+      show: false
+    }
+  },
+  computed: {
+    theme() {
+      return this.$store.state.settings.theme
+    }
+  },
+  watch: {
+    show(value) {
+      if (value && !this.clickNotClose) {
+        this.addEventClick()
+      }
+      if (value) {
+        addClass(document.body, 'showRightPanel')
+      } else {
+        removeClass(document.body, 'showRightPanel')
+      }
+    }
+  },
+  mounted() {
+    this.insertToBody()
+  },
+  beforeDestroy() {
+    const elx = this.$refs.rightPanel
+    elx.remove()
+  },
+  methods: {
+    addEventClick() {
+      window.addEventListener('click', this.closeSidebar)
+    },
+    closeSidebar(evt) {
+      const parent = evt.target.closest('.rightPanel')
+      if (!parent) {
+        this.show = false
+        window.removeEventListener('click', this.closeSidebar)
+      }
+    },
+    insertToBody() {
+      const elx = this.$refs.rightPanel
+      const body = document.querySelector('body')
+      body.insertBefore(elx, body.firstChild)
+    }
+  }
+}
+</script>
+
+<style>
+.showRightPanel {
+  overflow: hidden;
+  position: relative;
+  width: calc(100% - 15px);
+}
+</style>
+
+<style lang="scss" scoped>
+.rightPanel-background {
+  position: fixed;
+  top: 0;
+  left: 0;
+  opacity: 0;
+  transition: opacity .3s cubic-bezier(.7, .3, .1, 1);
+  background: rgba(0, 0, 0, .2);
+  z-index: -1;
+}
+
+.rightPanel {
+  width: 100%;
+  max-width: 260px;
+  height: 100vh;
+  position: fixed;
+  top: 0;
+  right: 0;
+  box-shadow: 0px 0px 15px 0px rgba(0, 0, 0, .05);
+  transition: all .25s cubic-bezier(.7, .3, .1, 1);
+  transform: translate(100%);
+  background: #fff;
+  z-index: 40000;
+}
+
+.show {
+  transition: all .3s cubic-bezier(.7, .3, .1, 1);
+
+  .rightPanel-background {
+    z-index: 20000;
+    opacity: 1;
+    width: 100%;
+    height: 100%;
+  }
+
+  .rightPanel {
+    transform: translate(0);
+  }
+}
+
+.handle-button {
+  width: 48px;
+  height: 48px;
+  position: absolute;
+  left: -48px;
+  text-align: center;
+  font-size: 24px;
+  border-radius: 6px 0 0 6px !important;
+  z-index: 0;
+  pointer-events: auto;
+  cursor: pointer;
+  color: #fff;
+  line-height: 48px;
+  i {
+    font-size: 24px;
+    line-height: 48px;
+  }
+}
+</style>
diff --git a/src/components/ThemePicker/index.vue b/src/components/ThemePicker/index.vue
new file mode 100644
index 0000000..3879c5a
--- /dev/null
+++ b/src/components/ThemePicker/index.vue
@@ -0,0 +1,175 @@
+<template>
+  <el-color-picker
+    v-model="theme"
+    :predefine="['#409EFF', '#1890ff', '#304156','#212121','#11a983', '#13c2c2', '#6959CD', '#f5222d', ]"
+    class="theme-picker"
+    popper-class="theme-picker-dropdown"
+  />
+</template>
+
+<script>
+const version = require('element-ui/package.json').version // element-ui version from node_modules
+const ORIGINAL_THEME = '#409EFF' // default color
+
+export default {
+  data() {
+    return {
+      chalk: '', // content of theme-chalk css
+      theme: ''
+    }
+  },
+  computed: {
+    defaultTheme() {
+      return this.$store.state.settings.theme
+    }
+  },
+  watch: {
+    defaultTheme: {
+      handler: function(val, oldVal) {
+        this.theme = val
+      },
+      immediate: true
+    },
+    async theme(val) {
+      const oldVal = this.chalk ? this.theme : ORIGINAL_THEME
+      if (typeof val !== 'string') return
+      const themeCluster = this.getThemeCluster(val.replace('#', ''))
+      const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
+      console.log(themeCluster, originalCluster)
+
+      const $message = this.$message({
+        message: '  Compiling the theme',
+        customClass: 'theme-message',
+        type: 'success',
+        duration: 0,
+        iconClass: 'el-icon-loading'
+      })
+
+      const getHandler = (variable, id) => {
+        return () => {
+          const originalCluster = this.getThemeCluster(ORIGINAL_THEME.replace('#', ''))
+          const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster)
+
+          let styleTag = document.getElementById(id)
+          if (!styleTag) {
+            styleTag = document.createElement('style')
+            styleTag.setAttribute('id', id)
+            document.head.appendChild(styleTag)
+          }
+          styleTag.innerText = newStyle
+        }
+      }
+
+      if (!this.chalk) {
+        const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`
+        await this.getCSSString(url, 'chalk')
+      }
+
+      const chalkHandler = getHandler('chalk', 'chalk-style')
+
+      chalkHandler()
+
+      const styles = [].slice.call(document.querySelectorAll('style'))
+        .filter(style => {
+          const text = style.innerText
+          return new RegExp(oldVal, 'i').test(text) && !/Chalk Variables/.test(text)
+        })
+      styles.forEach(style => {
+        const { innerText } = style
+        if (typeof innerText !== 'string') return
+        style.innerText = this.updateStyle(innerText, originalCluster, themeCluster)
+      })
+
+      this.$emit('change', val)
+
+      $message.close()
+    }
+  },
+
+  methods: {
+    updateStyle(style, oldCluster, newCluster) {
+      let newStyle = style
+      oldCluster.forEach((color, index) => {
+        newStyle = newStyle.replace(new RegExp(color, 'ig'), newCluster[index])
+      })
+      return newStyle
+    },
+
+    getCSSString(url, variable) {
+      return new Promise(resolve => {
+        const xhr = new XMLHttpRequest()
+        xhr.onreadystatechange = () => {
+          if (xhr.readyState === 4 && xhr.status === 200) {
+            this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '')
+            resolve()
+          }
+        }
+        xhr.open('GET', url)
+        xhr.send()
+      })
+    },
+
+    getThemeCluster(theme) {
+      const tintColor = (color, tint) => {
+        let red = parseInt(color.slice(0, 2), 16)
+        let green = parseInt(color.slice(2, 4), 16)
+        let blue = parseInt(color.slice(4, 6), 16)
+
+        if (tint === 0) { // when primary color is in its rgb space
+          return [red, green, blue].join(',')
+        } else {
+          red += Math.round(tint * (255 - red))
+          green += Math.round(tint * (255 - green))
+          blue += Math.round(tint * (255 - blue))
+
+          red = red.toString(16)
+          green = green.toString(16)
+          blue = blue.toString(16)
+
+          return `#${red}${green}${blue}`
+        }
+      }
+
+      const shadeColor = (color, shade) => {
+        let red = parseInt(color.slice(0, 2), 16)
+        let green = parseInt(color.slice(2, 4), 16)
+        let blue = parseInt(color.slice(4, 6), 16)
+
+        red = Math.round((1 - shade) * red)
+        green = Math.round((1 - shade) * green)
+        blue = Math.round((1 - shade) * blue)
+
+        red = red.toString(16)
+        green = green.toString(16)
+        blue = blue.toString(16)
+
+        return `#${red}${green}${blue}`
+      }
+
+      const clusters = [theme]
+      for (let i = 0; i <= 9; i++) {
+        clusters.push(tintColor(theme, Number((i / 10).toFixed(2))))
+      }
+      clusters.push(shadeColor(theme, 0.1))
+      return clusters
+    }
+  }
+}
+</script>
+
+<style>
+.theme-message,
+.theme-picker-dropdown {
+  z-index: 99999 !important;
+}
+
+.theme-picker .el-color-picker__trigger {
+  height: 26px !important;
+  width: 26px !important;
+  padding: 2px;
+}
+
+.theme-picker-dropdown .el-color-dropdown__link-btn {
+  display: none;
+}
+</style>
diff --git a/src/layout/components/Settings/index.vue b/src/layout/components/Settings/index.vue
new file mode 100644
index 0000000..e0490c9
--- /dev/null
+++ b/src/layout/components/Settings/index.vue
@@ -0,0 +1,109 @@
+<template>
+  <div class="drawer-container">
+    <div>
+      <h3 class="drawer-title">Page style setting</h3>
+
+      <div class="drawer-item">
+        <span>Theme Color</span>
+        <theme-picker style="float: right;height: 26px;margin: -3px 8px 0 0;" @change="themeChange" />
+      </div>
+
+      <!--      姝や笁涓姛鑳芥殏鏃朵笉鐢�-->
+      <!--      <div class="drawer-item">-->
+      <!--        <span>Open Tags-View</span>-->
+      <!--        <el-switch v-model="tagsView" class="drawer-switch" />-->
+      <!--      </div>-->
+
+      <!--      <div class="drawer-item">-->
+      <!--        <span>Fixed Header</span>-->
+      <!--        <el-switch v-model="fixedHeader" class="drawer-switch" />-->
+      <!--      </div>-->
+
+      <!--      <div class="drawer-item">-->
+      <!--        <span>Sidebar Logo</span>-->
+      <!--        <el-switch v-model="sidebarLogo" class="drawer-switch" />-->
+      <!--      </div>-->
+
+    </div>
+  </div>
+</template>
+
+<script>
+import ThemePicker from '@/components/ThemePicker'
+
+export default {
+  components: { ThemePicker },
+  data() {
+    return {}
+  },
+  computed: {
+    fixedHeader: {
+      get() {
+        return this.$store.state.settings.fixedHeader
+      },
+      set(val) {
+        this.$store.dispatch('settings/changeSetting', {
+          key: 'fixedHeader',
+          value: val
+        })
+      }
+    },
+    tagsView: {
+      get() {
+        return this.$store.state.settings.tagsView
+      },
+      set(val) {
+        this.$store.dispatch('settings/changeSetting', {
+          key: 'tagsView',
+          value: val
+        })
+      }
+    },
+    sidebarLogo: {
+      get() {
+        return this.$store.state.settings.sidebarLogo
+      },
+      set(val) {
+        this.$store.dispatch('settings/changeSetting', {
+          key: 'sidebarLogo',
+          value: val
+        })
+      }
+    }
+  },
+  methods: {
+    themeChange(val) {
+      this.$store.dispatch('settings/changeSetting', {
+        key: 'theme',
+        value: val
+      })
+    }
+  }
+}
+</script>
+
+<style lang="scss" scoped>
+.drawer-container {
+  padding: 24px;
+  font-size: 14px;
+  line-height: 1.5;
+  word-wrap: break-word;
+
+  .drawer-title {
+    margin-bottom: 12px;
+    color: rgba(0, 0, 0, .85);
+    font-size: 14px;
+    line-height: 22px;
+  }
+
+  .drawer-item {
+    color: rgba(0, 0, 0, .65);
+    font-size: 14px;
+    padding: 12px 0;
+  }
+
+  .drawer-switch {
+    float: right
+  }
+}
+</style>
diff --git a/src/layout/components/index.js b/src/layout/components/index.js
index 9fc98d6..9e7c4a5 100644
--- a/src/layout/components/index.js
+++ b/src/layout/components/index.js
@@ -2,3 +2,4 @@
 export { default as Sidebar } from './Sidebar'
 export { default as AppMain } from './AppMain'
 export { default as TagsView } from './TagsView'
+export { default as Settings } from './Settings'
diff --git a/src/layout/index.vue b/src/layout/index.vue
index 6ae88f3..58ca9b0 100644
--- a/src/layout/index.vue
+++ b/src/layout/index.vue
@@ -8,13 +8,17 @@
         <tags-view v-if="needTagsView" />
       </div>
       <app-main />
+      <right-panel v-if="showSettings">
+        <settings />
+      </right-panel>
     </div>
   </div>
 </template>
 
 <script>
-import { Navbar, Sidebar, AppMain, TagsView } from './components'
+import { Navbar, Sidebar, AppMain, TagsView, Settings } from './components'
 import ResizeMixin from './mixin/ResizeHandler'
+import RightPanel from '@/components/RightPanel'
 
 export default {
   name: 'Layout',
@@ -22,7 +26,9 @@
     Navbar,
     Sidebar,
     AppMain,
-    TagsView
+    TagsView,
+    RightPanel,
+    Settings
   },
   mixins: [ResizeMixin],
   computed: {
@@ -37,6 +43,9 @@
     },
     fixedHeader() {
       return this.$store.state.settings.fixedHeader
+    },
+    showSettings() {
+      return this.$store.state.settings.showSettings
     },
     classObj() {
       return {
@@ -56,43 +65,45 @@
 </script>
 
 <style lang="scss" scoped>
-  @import "~@/styles/mixin.scss";
-  @import "~@/styles/variables.scss";
+@import "~@/styles/mixin.scss";
+@import "~@/styles/variables.scss";
 
-  .app-wrapper {
-    @include clearfix;
-    position: relative;
-    height: 100%;
-    width: 100%;
-    &.mobile.openSidebar{
-      position: fixed;
-      top: 0;
-    }
-  }
-  .drawer-bg {
-    background: #000;
-    opacity: 0.3;
-    width: 100%;
-    top: 0;
-    height: 100%;
-    position: absolute;
-    z-index: 999;
-  }
+.app-wrapper {
+  @include clearfix;
+  position: relative;
+  height: 100%;
+  width: 100%;
 
-  .fixed-header {
+  &.mobile.openSidebar {
     position: fixed;
     top: 0;
-    right: 0;
-    z-index: 9;
-    width: calc(100% - #{$sideBarWidth});
-    transition: width 0.28s;
   }
+}
 
-  .hideSidebar .fixed-header {
-    width: calc(100% - 54px)
-  }
+.drawer-bg {
+  background: #000;
+  opacity: 0.3;
+  width: 100%;
+  top: 0;
+  height: 100%;
+  position: absolute;
+  z-index: 999;
+}
 
-  .mobile .fixed-header {
-    width: 100%;
-  }
+.fixed-header {
+  position: fixed;
+  top: 0;
+  right: 0;
+  z-index: 9;
+  width: calc(100% - #{$sideBarWidth});
+  transition: width 0.28s;
+}
+
+.hideSidebar .fixed-header {
+  width: calc(100% - 54px)
+}
+
+.mobile .fixed-header {
+  width: 100%;
+}
 </style>
diff --git a/src/settings.js b/src/settings.js
index 8f14f63..8c2deab 100644
--- a/src/settings.js
+++ b/src/settings.js
@@ -13,6 +13,17 @@
    * @description Whether show the logo in sidebar
    */
   sidebarLogo: false,
-  tagsView: true // tagsView鏄鹃殣鎺у埗
+
+  /**
+   * @type {boolean} true | false
+   * @description Whether show the settings right-panel
+   */
+  showSettings: true,
+
+  /**
+   * @type {boolean} true | false
+   * @description Whether need tagsView
+   */
+  tagsView: true
 
 }
diff --git a/src/store/modules/settings.js b/src/store/modules/settings.js
index fd3ed35..dd8931e 100644
--- a/src/store/modules/settings.js
+++ b/src/store/modules/settings.js
@@ -1,8 +1,10 @@
 import defaultSettings from '@/settings'
+import variables from '@/styles/element-variables.scss'
 
 const { showSettings, tagsView, fixedHeader, sidebarLogo } = defaultSettings
 
 const state = {
+  theme: variables.theme,
   showSettings: showSettings,
   fixedHeader: fixedHeader,
   sidebarLogo: sidebarLogo,
diff --git a/src/styles/element-variables.scss b/src/styles/element-variables.scss
new file mode 100644
index 0000000..5bdc4da
--- /dev/null
+++ b/src/styles/element-variables.scss
@@ -0,0 +1,31 @@
+/**
+* I think element-ui's default theme color is too light for long-term use.
+* So I modified the default color and you can modify it to your liking.
+**/
+
+/* theme color */
+$--color-primary: #1890ff;
+$--color-success: #13ce66;
+$--color-warning: #ffba00;
+$--color-danger: #ff4949;
+// $--color-info: #1E1E1E;
+
+$--button-font-weight: 400;
+
+// $--color-text-regular: #1f2d3d;
+
+$--border-color-light: #dfe4ed;
+$--border-color-lighter: #e6ebf5;
+
+$--table-border: 1px solid #dfe6ec;
+
+/* icon font path, required */
+$--font-path: "~element-ui/lib/theme-chalk/fonts";
+
+@import "~element-ui/packages/theme-chalk/src/index";
+
+// the :export directive is the magic sauce for webpack
+// https://www.bluematador.com/blog/how-to-share-variables-between-js-and-sass
+:export {
+  theme: $--color-primary;
+}
diff --git a/src/utils/index.js b/src/utils/index.js
index 4830c04..3225d3c 100644
--- a/src/utils/index.js
+++ b/src/utils/index.js
@@ -98,6 +98,69 @@
  * @param {string} url
  * @returns {Object}
  */
+export function getQueryObject(url) {
+  url = url == null ? window.location.href : url
+  const search = url.substring(url.lastIndexOf('?') + 1)
+  const obj = {}
+  const reg = /([^?&=]+)=([^?&=]*)/g
+  search.replace(reg, (rs, $1, $2) => {
+    const name = decodeURIComponent($1)
+    let val = decodeURIComponent($2)
+    val = String(val)
+    obj[name] = val
+    return rs
+  })
+  return obj
+}
+
+/**
+ * @param {string} input value
+ * @returns {number} output value
+ */
+export function byteLength(str) {
+  // returns the byte length of an utf8 string
+  let s = str.length
+  for (var i = str.length - 1; i >= 0; i--) {
+    const code = str.charCodeAt(i)
+    if (code > 0x7f && code <= 0x7ff) s++
+    else if (code > 0x7ff && code <= 0xffff) s += 2
+    if (code >= 0xDC00 && code <= 0xDFFF) i--
+  }
+  return s
+}
+
+/**
+ * @param {Array} actual
+ * @returns {Array}
+ */
+export function cleanArray(actual) {
+  const newArray = []
+  for (let i = 0; i < actual.length; i++) {
+    if (actual[i]) {
+      newArray.push(actual[i])
+    }
+  }
+  return newArray
+}
+
+/**
+ * @param {Object} json
+ * @returns {Array}
+ */
+export function param(json) {
+  if (!json) return ''
+  return cleanArray(
+    Object.keys(json).map(key => {
+      if (json[key] === undefined) return ''
+      return encodeURIComponent(key) + '=' + encodeURIComponent(json[key])
+    })
+  ).join('&')
+}
+
+/**
+ * @param {string} url
+ * @returns {Object}
+ */
 export function param2Obj(url) {
   const search = decodeURIComponent(url.split('?')[1]).replace(/\+/g, ' ')
   if (!search) {
@@ -115,3 +178,180 @@
   })
   return obj
 }
+
+/**
+ * @param {string} val
+ * @returns {string}
+ */
+export function html2Text(val) {
+  const div = document.createElement('div')
+  div.innerHTML = val
+  return div.textContent || div.innerText
+}
+
+/**
+ * Merges two objects, giving the last one precedence
+ * @param {Object} target
+ * @param {(Object|Array)} source
+ * @returns {Object}
+ */
+export function objectMerge(target, source) {
+  if (typeof target !== 'object') {
+    target = {}
+  }
+  if (Array.isArray(source)) {
+    return source.slice()
+  }
+  Object.keys(source).forEach(property => {
+    const sourceProperty = source[property]
+    if (typeof sourceProperty === 'object') {
+      target[property] = objectMerge(target[property], sourceProperty)
+    } else {
+      target[property] = sourceProperty
+    }
+  })
+  return target
+}
+
+/**
+ * @param {HTMLElement} element
+ * @param {string} className
+ */
+export function toggleClass(element, className) {
+  if (!element || !className) {
+    return
+  }
+  let classString = element.className
+  const nameIndex = classString.indexOf(className)
+  if (nameIndex === -1) {
+    classString += '' + className
+  } else {
+    classString =
+      classString.substr(0, nameIndex) +
+      classString.substr(nameIndex + className.length)
+  }
+  element.className = classString
+}
+
+/**
+ * @param {string} type
+ * @returns {Date}
+ */
+export function getTime(type) {
+  if (type === 'start') {
+    return new Date().getTime() - 3600 * 1000 * 24 * 90
+  } else {
+    return new Date(new Date().toDateString())
+  }
+}
+
+/**
+ * @param {Function} func
+ * @param {number} wait
+ * @param {boolean} immediate
+ * @return {*}
+ */
+export function debounce(func, wait, immediate) {
+  let timeout, args, context, timestamp, result
+
+  const later = function() {
+    // 鎹笂涓�娆¤Е鍙戞椂闂撮棿闅�
+    const last = +new Date() - timestamp
+
+    // 涓婃琚寘瑁呭嚱鏁拌璋冪敤鏃堕棿闂撮殧 last 灏忎簬璁惧畾鏃堕棿闂撮殧 wait
+    if (last < wait && last > 0) {
+      timeout = setTimeout(later, wait - last)
+    } else {
+      timeout = null
+      // 濡傛灉璁惧畾涓篿mmediate===true锛屽洜涓哄紑濮嬭竟鐣屽凡缁忚皟鐢ㄨ繃浜嗘澶勬棤闇�璋冪敤
+      if (!immediate) {
+        result = func.apply(context, args)
+        if (!timeout) context = args = null
+      }
+    }
+  }
+
+  return function(...args) {
+    context = this
+    timestamp = +new Date()
+    const callNow = immediate && !timeout
+    // 濡傛灉寤舵椂涓嶅瓨鍦紝閲嶆柊璁惧畾寤舵椂
+    if (!timeout) timeout = setTimeout(later, wait)
+    if (callNow) {
+      result = func.apply(context, args)
+      context = args = null
+    }
+
+    return result
+  }
+}
+
+/**
+ * This is just a simple version of deep copy
+ * Has a lot of edge cases bug
+ * If you want to use a perfect deep copy, use lodash's _.cloneDeep
+ * @param {Object} source
+ * @returns {Object}
+ */
+export function deepClone(source) {
+  if (!source && typeof source !== 'object') {
+    throw new Error('error arguments', 'deepClone')
+  }
+  const targetObj = source.constructor === Array ? [] : {}
+  Object.keys(source).forEach(keys => {
+    if (source[keys] && typeof source[keys] === 'object') {
+      targetObj[keys] = deepClone(source[keys])
+    } else {
+      targetObj[keys] = source[keys]
+    }
+  })
+  return targetObj
+}
+
+/**
+ * @param {Array} arr
+ * @returns {Array}
+ */
+export function uniqueArr(arr) {
+  return Array.from(new Set(arr))
+}
+
+/**
+ * @returns {string}
+ */
+export function createUniqueString() {
+  const timestamp = +new Date() + ''
+  const randomNum = parseInt((1 + Math.random()) * 65536) + ''
+  return (+(randomNum + timestamp)).toString(32)
+}
+
+/**
+ * Check if an element has a class
+ * @param {HTMLElement} elm
+ * @param {string} cls
+ * @returns {boolean}
+ */
+export function hasClass(ele, cls) {
+  return !!ele.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'))
+}
+
+/**
+ * Add class to element
+ * @param {HTMLElement} elm
+ * @param {string} cls
+ */
+export function addClass(ele, cls) {
+  if (!hasClass(ele, cls)) ele.className += ' ' + cls
+}
+
+/**
+ * Remove class from element
+ * @param {HTMLElement} elm
+ * @param {string} cls
+ */
+export function removeClass(ele, cls) {
+  if (hasClass(ele, cls)) {
+    const reg = new RegExp('(\\s|^)' + cls + '(\\s|$)')
+    ele.className = ele.className.replace(reg, ' ')
+  }
+}

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