Vue动态创建组件实例并挂载到body
方式一
import Vue from 'vue'
/**
* @param Component 组件实例的选项对象
* @param props 组件实例中的prop
*/
export function create(Component, props) {
const comp = new (Vue.extend(Component))({ propsData: props }).$mount()
document.body.appendChild(comp.$el)
comp.remove = () => {
document.body.removeChild(comp.$el)
comp.$destroy()
}
return comp
}
方式二
import Vue from 'vue'
export function create(Component, props) {
// 借鸡生蛋new Vue({render() {}}),在render中把Component作为根组件
const vm = new Vue({
// h是createElement函数，它可以返回虚拟dom
render(h) {
console.log(h(Component,{ props }));
// 将Component作为根组件渲染出来
// h(标签名称或组件配置对象，传递属性、事件等，孩子元素)
return h(Component, { props })
}
}).$mount() // 挂载是为了把虚拟dom变成真实dom
// 不挂载就没有真实dom
// 手动追加至body
// 挂载之后$el可以访问到真实dom
document.body.appendChild(vm.$el)
console.log(vm.$children);
// 实例
const comp = vm.$children[0]
// 淘汰机制
comp.remove = () => {
// 删除dom
document.body.removeChild(vm.$el)
// 销毁组件
vm.$destroy()
}
// 返回Component组件实例
return comp
}
使用
- A组件（要动态创建的组件）
<template>
<div class="a">
<h2>{{ title }}</h2>
<p>{{ data }}</p>
</div>
</template>
<script>
export default {
props: {
title: {
type: String,
default: "hello world!"
},
message: {
type: String,
default: "o(∩_∩)o 哈哈"
},
duration: {
type: Number,
default: 1000
}
},
data() {
return {
data: "我是a组件",
};
},
created() {
let num = 1
const timer = setInterval(() => {
this.data = num++
}, this.duration)
this.$once("hook: beforeDestroy", () => clearInterval(timer))
}
};
</script>
<style>
.a {
position: fixed;
width: 100%;
top: 16px;
left: 0;
text-align: center;
pointer-events: none;
background-color: #fff;
border: grey 3px solid;
box-sizing: border-box;
}
</style>
- B组件（操作动态创建组件的地方）
<template> <div class="b"> <button @click="createA">创建</button> </div> </template> <script> import A from "@/components/A.vue" import { create } from "@/utils/create.js" export default { components: { A, }, methods: { createA() { // 创建A组件，并挂载到body上 create(A, { title: "vue", message: "么么哒😙" }) // 可以实现功能。，没问题，但是每次引入那么多组件，方法很不方便，下面改写成用this.$comp.来调用 } }, }; </script>
图片点击放大组件改写：
需求： 组件需要挂载到body节点上，因为弹窗里面再弹窗会导致遮罩层很小的问题，这里就需要重新挂载到body上
imgBig.vue 组件
<template>
<div v-if="imgBigVisible1" tabindex="-1" class="img-viewer__wrapper" style="z-index: 9999"> <!--v-if="imgBigVisible1"-->
<div class="img-viewer__mask"></div>
<span class="img-viewer__btn img-viewer__close" @click="close">
<i class="el-icon-circle-close"></i>
</span>
<div class="img-viewer__btn img-viewer__actions">
<div class="img-viewer__actions__inner">
<i class="el-icon-zoom-out" @click="zoomOut"></i>
<i class="el-icon-zoom-in" @click="zoomIn"></i>
<i class="img-viewer__actions__divider"></i>
<i :class="[original?'el-icon-full-screen':'el-icon-c-scale-to-original']" @click="zoom"></i>
<i class="img-viewer__actions__divider"></i>
<i class="el-icon-refresh-left" @click="rotateLeft"></i>
<i class="el-icon-refresh-right" @click="rotateRight"></i>
</div>
</div>
<div class="img-viewer__canvas">
<img
:src="srcURL"
class="img-viewer__img"
:style="[{transform: `scale(${scale}) rotate(${deger}deg)`}, original?maxStyle:'']"
/>
</div>
</div>
</template>
<script>
export default {
props: {
// imgBigVisible: {
// type: Boolean,
// default: false
// },
srcURL: {
type: String,
default: ''
}
},
data() {
return {
imgBigVisible1: false,
scale: 1,
deger: 0,
original: false,
maxStyle: {
maxHeight: '100%',
maxWidth: '100%'
}
};
},
computed: {
},
watch: {
// imgBigVisible (v, ov) {
// console.log('props imgBigVisible', v)
// this.imgBigVisible1 = v
// },
srcURL (v, ov) { // props传值
console.log('src====', typeof v)
}
},
methods: {
show () {
this.imgBigVisible1 = true
},
close () {
this.imgBigVisible1 = false
this.$emit('update:imgBigVisible', this.imgBigVisible1)
},
zoom () {
this.original = !this.original
this.scale = 1
this.deger = 0
},
zoomOut () {
this.scale -= 0.2
if (this.scale < 0.2) {
this.scale = 0.2
return
}
},
zoomIn () {
this.scale += 0.2
},
rotateLeft () {
this.deger -= 90
},
rotateRight () {
this.deger += 90
}
},
};
</script>
<style lang="scss" scoped>
.img-viewer__wrapper {
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
.img-viewer__mask {
position: absolute;
width: 100%;
height: 100%;
top: 0;
left: 0;
opacity: .5;
background: #000;
}
.img-viewer__btn {
position: absolute;
z-index: 1;
display: -ms-flexbox;
display: flex;
-ms-flex-align: center;
align-items: center;
-ms-flex-pack: center;
justify-content: center;
border-radius: 50%;
opacity: .8;
cursor: pointer;
box-sizing: border-box;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
.img-viewer__close {
top: 40px;
right: 40px;
width: 40px;
height: 40px;
font-size: 40px;
color: #c7c7c7;
}
.img-viewer__actions {
left: 50%;
bottom: 30px;
transform: translateX(-50%);
width: 282px;
height: 44px;
padding: 0 23px;
background-color: #606266;
border-color: #fff;
border-radius: 22px;
.img-viewer__actions__inner {
width: 100%;
height: 100%;
text-align: justify;
cursor: default;
font-size: 23px;
color: #fff;
display: -ms-flexbox;
display: flex;
-ms-flex-align: center;
align-items: center;
-ms-flex-pack: distribute;
justify-content: space-around;
}
}
.img-viewer__canvas {
width: 100%;
height: 100%;
display: -ms-flexbox;
display: flex;
-ms-flex-pack: center;
justify-content: center;
-ms-flex-align: center;
align-items: center;
}
.img-viewer__img {
margin-left: 0px;
margin-top: 0px;
transition: transform 0.3s ease 0s;
}
}
</style>
index.js
import Vue from 'vue' import imgBig from './imgBig' let imgBigConstructor = Vue.extend(imgBig) const myImgBig = (props) => { const instance = new imgBigConstructor({ // 生成实例 propsData: props // 注意这里propsData不要写错了 }) instance.$mount() // 实例挂载 document.body.appendChild(instance.$el);//3原生方法插入body return instance } export default myImgBig
main.js 引入
import imgBig from '@/temp/imgBig/index.js'
Vue.prototype.$imgBig = imgBig
父组件调用
<span v-if="isImgFile(item.name)" style="cursor:pointer;" @click="viewImgBig(item.url)">{{item.name}}</span> ... isImgFile(value){ return value.endWith('.jpg') || value.endWith('.jpeg') || value.endWith('.png'); }, viewImgBig (src) { this.$imgBig({srcURL: src}).show() },
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