Vue项目中封装组件的简单步骤记录

目录

• 前言
• 如何封装一个Toast组件
• 使用案例
• 具体实现
• 总结

vm.$toast('网络异常！')

* message 提示信息内容
* duration 停留时间，单位为毫秒
* position 显示位置：top、middle、bottom
* className 样式名称
vm.$toast({
    message: '网络异常！',
    duration: 2000,
    position: 'middle',
    className: 'big'
})

vm.$toast({
    message: '验证码错误！',
    duration: 2000,
    type: 'error'
})

<template>
    <transition name="toast-pop">
        <div v-show="visible" class="toast" :class="customClass" @click="handleClose">
            <span class="text">{{message}}</span>
        </div>
    </transition>
</template>
<script>
    export default {
        name: 'Toast',
        props: {
            message: String, // 提示信息内容
            className: { // 样式名
                type: String,
                default: ''
            },
            position: { // 位置：top、middle、bottom
                type: String,
                default: 'middle'
            },
            type: { // 提示类型：normal、error
                type: String,
                defalut: 'normal'
            }
        },
        data () {
            return {
                // 是否显示
                visible: false
            }
        },
        computed: {
            // 获取样式
            customClass () {
                let classes = []
                classes.push('toast-' + this.type)
                switch (this.positon) {
                    case 'top':
                        classes.push('is-placetop')
                        break
                    case 'bottom':
                        classes.push('is-placebottom')
                        break
                    default:
                        classes.push('is-placemiddle')
                }
                this.className && classes.push(this.className)
                return classes
            }
        },
        methods: {
            handleClose () {
                this.$emit('close')
            }
        }
    }
</script>
<style lang="scss" scoped px2rem="false">
    .toast {
        position: fixed;
        box-sizing: border-box;
        min-width: 200px;
        max-width: 50%;
        max-height: 85%;
        margin-top: 0;
        padding: 18px 30px;
        border-radius: 10px;
        background: rgba(0, 0, 0, 0.7);
        color: #fff;
        text-align: center;
        overflow-y: auto;
        z-index: 2000;
        .text {
            display: block;
            font-size: 16px;
            line-height: 1.5;
            text-align: center;
            word-wrap: break-word;
        }
    }
    .is-placetop {
        top: 50px;
        left: 50%;
        transform: translate(-50%, 0);
    }
    .is-placemiddle {
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
    .is-placebottom {
        bottom: 50px;
        left: 50%;
        transform: translate(-50%, 0);
    }
    .is-placetop.toast-pop-enter-active, .is-placetop.toast-pop-leave-active,
    .is-placemiddle.toast-pop-enter-active, .is-placemiddle.toast-pop-leave-active {
        transition: opacity .3s linear, margin-top .3s ease;
    }
    .is-placetop.toast-pop-enter, .is-placetop.toast-pop-leave-to,
    .is-placemiddle.toast-pop-enter, .is-placemiddle.toast-pop-leave-to {
        margin-top: 30px;
        opacity: 0;
    }
    .is-placebottom.toast-pop-enter-active, .is-placebottom.toast-pop-leave-active {
        transition: opacity .3s linear, margin-bottom .3s ease;
    }
    .is-placebottom.toast-pop-enter, .is-placebottom.toast-pop-leave-to {
        margin-bottom: -30px;
        opacity: 0;
    }
    .toast-error {
        background: rgba(255,102,104,.9);
    }
</style>

import Vue from 'vue'
import Toast from './toast.vue'
// toast构造函数
const ToastConstructor = Vue.extend({
    extends: Toast
})
// toast实例池
let toastPool = []
/** 获取toast实例（实例池中有从池中取，没有则新建） */
let getInstance = () => {
    // console.log('toastPool:', toastPool)
    if (toastPool.length > 0) {
        return toastPool.shift()
    }
    return new ToastConstructor({
        el: document.createElement('div')
    })
}
/** 归还实例到实例池 */
let returnInstance = instance => {
    if (instance) {
        toastPool.push(instance)
        // console.log('归还实例:', instance, toastPool)
    }
}
/** 文档中移除toast的DOM节点 */
function removeDom (event) {
    if (event.target.parentNode) {
        event.target.parentNode.removeChild(event.target)
    }
}
// 关闭
ToastConstructor.prototype.close = function () {
    this.visible = false // 不可见
    this.closed = true // 关闭状态
    this.$el.addEventListener('transitionend', removeDom) // 动画完成后移除DOM节点
    returnInstance(this) // 实例对象归还到实例池，实例可以重复利用
}
// 显示toast提示信息
export default function (options = {}) {
    // 显示时间，默认3秒
    let duration = options.duration || 3000
    let instance = getInstance()
    // console.log('instance=', instance)
    // 显示类型
    instance.type = options.type || 'normal'
    // 显示内容
    instance.message = typeof options === 'string' ? options : options.message
    // 显示位置：top、middle、bottom
    instance.position = options.position || 'middle'
    instance.className = options.className || ''
    // 移除动画完成事件
    instance.$el.removeEventListener('transitionend', removeDom)
    instance.$on('close', () => {
        instance.close()
    })
    // console.log('instance.$el=', instance.$el)
    // 将节点添加到文档
    document.body.appendChild(instance.$el)
    instance.visible = true
    instance.closed = false
    // 清除定时器
    instance.timer && clearTimeout(instance.timer)
    // 设置定时器，关闭toast
    instance.timer = setTimeout(() => {
        // console.log('关闭', instance)
        !instance.closed && instance.close()
        instance.timer = null
    }, duration)
}

import ToastPlugin from './plugins/toastPlugin.js'
// toast提示信息插件
Vue.use(ToastPlugin)