vue2插件

作者: wu0228 | 来源:发表于2022-04-11 17:23 被阅读0次

    插件

    插件通常用来为 Vue 添加全局功能。插件的功能范围没有严格的限制——一般有下面几种:

    1. 添加全局方法或者 property。如:vue-custom-element

    2. 添加全局资源:指令/过滤器/过渡等。如 vue-touch

    3. 通过全局混入来添加一些组件选项。如 vue-router

    4. 添加 Vue 实例方法,通过把它们添加到 Vue.prototype 上实现。

    5. 一个库,提供自己的 API,同时提供上面提到的一个或多个功能。如 vue-router

    使用插件

    通过全局方法 Vue.use() 使用插件。它需要在你调用 new Vue() 启动应用之前完成:

    // 调用 `MyPlugin.install(Vue)`
    Vue.use(MyPlugin)
    
    new Vue({
      // ...组件选项
    })
    

    也可以传入一个可选的选项对象:

    Vue.use(MyPlugin, { someOption: true })
    

    Vue.use 会自动阻止多次注册相同插件,届时即使多次调用也只会注册一次该插件。
    Vue.js 官方提供的一些插件 (例如 vue-router) 在检测到 Vue 是可访问的全局变量时会自动调用 Vue.use()。然而在像 CommonJS 这样的模块环境中,你应该始终显式地调用 Vue.use():

    // 用 Browserify 或 webpack 提供的 CommonJS 模块环境时
    var Vue = require('vue')
    var VueRouter = require('vue-router')
    
    // 不要忘了调用此方法
    Vue.use(VueRouter)
    

    awesome-vue 集合了大量由社区贡献的插件和库。

    开发插件

    Vue.js 的插件应该暴露一个 install 方法。这个方法的第一个参数是 Vue 构造器,第二个参数是一个可选的选项对象:

    MyPlugin.install = function (Vue, options) {
      // 1. 添加全局方法或 property
      Vue.myGlobalMethod = function () {
        // 逻辑...
      }
    
      // 2. 添加全局资源
      Vue.directive('my-directive', {
        bind (el, binding, vnode, oldVnode) {
          // 逻辑...
        }
        ...
      })
    
      // 3. 注入组件选项
      Vue.mixin({
        created: function () {
          // 逻辑...
        }
        ...
      })
    
      // 4. 添加实例方法
      Vue.prototype.$myMethod = function (methodOptions) {
        // 逻辑...
      }
    }
    
    数字验证码:
    import SIdentify from './src/identify'
    
    /* istanbul ignore next */
    SIdentify.install = function (Vue) {
      Vue.component(SIdentify.name, SIdentify)
    }
    
    export default SIdentify
    
    <template>
      <div class="s-canvas" style="display: flex;">
        <canvas id="s-canvas" :width="contentWidth" :height="contentHeight" @click="getValidCode"></canvas>
      </div>
    </template>
    <script>
    export default {
      name: 'SIdentify',
      props: {
        identifyCode: {
          type: String,
          default: '1234'
        },
        fontSizeMin: {
          type: Number,
          default: 16
        },
        fontSizeMax: {
          type: Number,
          default: 40
        },
        backgroundColorMin: {
          type: Number,
          default: 180
        },
        backgroundColorMax: {
          type: Number,
          default: 240
        },
        colorMin: {
          type: Number,
          default: 50
        },
        colorMax: {
          type: Number,
          default: 160
        },
        lineColorMin: {
          type: Number,
          default: 40
        },
        lineColorMax: {
          type: Number,
          default: 180
        },
        dotColorMin: {
          type: Number,
          default: 0
        },
        dotColorMax: {
          type: Number,
          default: 255
        },
        contentWidth: {
          type: Number,
          default: 153
        },
        contentHeight: {
          type: Number,
          default: 40
        }
      },
      methods: {
        // 生成一个随机数
        randomNum (min, max) {
          return Math.floor(Math.random() * (max - min) + min)
        },
        // 生成一个随机的颜色
        randomColor (min, max) {
          const r = this.randomNum(min, max)
          const g = this.randomNum(min, max)
          const b = this.randomNum(min, max)
          return 'rgb(' + r + ',' + g + ',' + b + ')'
        },
        drawPic () {
          const canvas = document.getElementById('s-canvas')
          const ctx = canvas.getContext('2d')
          ctx.textBaseline = 'bottom'
          // 绘制背景
          ctx.fillStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax)
          ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)
          // 绘制文字
          for (let i = 0; i < this.identifyCode.length; i++) {
            this.drawText(ctx, this.identifyCode[i], i)
          }
          this.drawLine(ctx)
          this.drawDot(ctx)
        },
        drawText (ctx, txt, i) {
          ctx.fillStyle = this.randomColor(this.colorMin, this.colorMax)
          ctx.font = this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei'
          const x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
          const y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
          const deg = this.randomNum(-45, 45)
          // 修改坐标原点和旋转角度
          ctx.translate(x, y)
          ctx.rotate(deg * Math.PI / 180)
          ctx.fillText(txt, 0, 0)
          // 恢复坐标原点和旋转角度
          ctx.rotate(-deg * Math.PI / 180)
          ctx.translate(-x, -y)
        },
        drawLine (ctx) {
          // 绘制干扰线
          for (let i = 0; i < 8; i++) {
            ctx.strokeStyle = this.randomColor(this.lineColorMin, this.lineColorMax)
            ctx.beginPath()
            ctx.moveTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
            ctx.lineTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
            ctx.stroke()
          }
        },
        drawDot (ctx) {
          // 绘制干扰点
          for (let i = 0; i < 100; i++) {
            ctx.fillStyle = this.randomColor(0, 255)
            ctx.beginPath()
            ctx.arc(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight), 1, 0, 2 * Math.PI)
            ctx.fill()
          }
        },
        getValidCode () {
          this.$emit('getValidCode')
        }
      },
      watch: {
        identifyCode () {
          this.drawPic()
        }
      },
      mounted () {
        this.drawPic()
      }
    }
    </script>
    

    提示信息

    import OperMsg from './components/OperMsg.vue'
    
    const OperTip = {
      install: function (Vue, options = {}) {
        const VueMsg = Vue.extend(OperMsg)
        let msg = null
    
        const $operTip = {
          show(methodOps = {}) {
            return new Promise(resolve => {
              let defaultNote = '操作成功'
              if (!msg) {
                msg = new VueMsg()
                console.log(msg.$props)
                if (msg.$props.msgType === 'error') {
                  defaultNote = '操作失败'
                }
                msg.$props.msgType = methodOps.type || 'success'
                msg.$props.msgContent = methodOps.content || defaultNote
                msg.$mount()
                document.querySelector(options.container || 'body').appendChild(msg.$el)
              }
              if (msg.$props.msgType === 'error') {
                defaultNote = '操作失败'
              }
              msg.$props.msgType = methodOps.type || 'success'
              msg.$props.msgContent = methodOps.content || defaultNote
              msg.show()
              resolve()
            })
          },
          hide() {
            return new Promise(resolve => {
              if (!msg) {
                resolve()
                return
              }
              msg.hide()
            })
          }
        }
    
        Vue.operTip = Vue.prototype.$operTip = $operTip
        // 注册组件
        Vue.component('operTip', OperMsg)
      }
    }
    
    export default OperTip
    
    <template>
      <div class="oper-msg-container"
           ref="msgContainer">
        <transition name="slide">
          <div class="msg"
               v-if="isShowMsg === 'show'"
               :style='{ backgroundColor: color }'>
            <img src="../../../assets/personalCenter/oper-tip-icon.png">
            &nbsp;&nbsp;{{ msgContent.length > 15 ? msgContent.substr(0, 15) + '...' :  msgContent }}
          </div>
        </transition>
      </div>
    </template>
    <script>
    export default {
      name: 'OperMsg',
      props: {
        msgType: {
          type: String,
          default: 'success'
        },
        msgContent: {
          type: String,
          default: ''
        }
      },
      data () {
        return {
          isShowMsg: 'hide',
          timer: null,
          clearHeightTimer: null,
          color: '#FFA300'
        }
      },
      mounted () {
      },
      watch: {
        isShowMsg (oldVal, newVal) {
          if (this.timer) {
            clearTimeout(this.timer)
          }
          if (newVal === 'hide') {
            this.timer = setTimeout(() => {
              this.hide()
            }, 3000)
          }
        }
      },
      methods: {
        show () {
          console.log(this.msgType)
          if (this.msgType === 'error') {
            this.color = '#ED6355'
          } else {
            this.color = '#FFA300'
          }
          this.isShowMsg = 'show'
        },
        hide () {
          this.isShowMsg = 'hide'
        }
      }
    }
    </script>
    <style lang="scss" scoped>
    .oper-msg-container {
      width: 100%;
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 10000;
      position: fixed;
      top: 5px;
      top: calc(5px + constant(safe-area-inset-top));
      top: calc(5px + env(safe-area-inset-top));
      background: transparent;
      .msg {
        display: flex;
        justify-content: center;
        align-items: center;
        padding: 10px 30px;
        font-size: 14px;
        font-weight: 500;
        color: rgba(255, 255, 255, 1);
        line-height: 14px;
        // background: rgba(255,163,0,1);
        border-radius: 20px;
        img {
          width: 20px;
          height: 20px;
        }
      }
      .slide-enter-active {
        animation: slideInDown 0.5s;
      }
      .slide-leave-active {
        animation: slideOutUp 0.5s;
      }
      @-webkit-keyframes slideInDown {
        from {
          -webkit-transform: translate3d(0, -100%, 0);
          transform: translate3d(0, -100%, 0);
          visibility: visible;
        }
        to {
          -webkit-transform: translate3d(0, 0, 0);
          transform: translate3d(0, 0, 0);
        }
      }
      @-webkit-keyframes slideOutUp {
        from {
          -webkit-transform: translate3d(0, 0, 0);
          transform: translate3d(0, 0, 0);
        }
        to {
          visibility: hidden;
          -webkit-transform: translate3d(0, -100%, 0);
          transform: translate3d(0, -100%, 0);
        }
      }
    }
    </style>
    

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