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：
添加全局方法或者 property。如：vue-custom-element
添加全局资源：指令/过滤器/过渡等。如 vue-touch
通过全局混入来添加一些组件选项。如 vue-router
添加 Vue 实例方法，通过把它们添加到
Vue.prototype上实现。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">
{{ 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>
