在router里面放置参数，然后通过调用route.params.xxx或者route.query.xxx进行获取
通过props进行通信
这里我们使用eventBus进行组件之间的通信
步骤
1.声明一个bus组件用于B组件把参数传递给A组件
//bus.js import Vue from 'vue'; export default new Vue();
2.在A组件中引用bus组件，并实时监听其参数变化
// A.vue
import Bus from '../../components/bus/bus.js'
export default {
components: { Bus },
data () {},
created: function () {
Bus.$on('getTarget', imgToken => {
var _this = this;
console.log(imgToken);
...
});
}
}3.B组件中同样引用bus组件，来把参数传给A组件
// B.vue
// 传参
Bus.$emit('getTarget', imgToken);参考：
vue-$on
vue-$emit
vue.js之路(4)——vue2.0s中eventBus实现兄弟组件通信
vue选图截图插件完整代码
<template>
<p class="myCropper-container">
<p id="myCropper-workspace">
<p class="myCropper-words" v-show="!imgCropperData.imgSrc">请点击按钮选择图片进行裁剪</p>
</p>
<p class="myCropper-preview" :class="isShort ? 'myCropper-preview-short' : 'myCropper-preview-long'">
<p class="myCropper-preview-1 avatar-preview">
</p>
<p class="myCropper-preview-2 avatar-preview">
</p>
<p class="myCropper-preview-3 avatar-preview">
</p>
<input id="myCropper-input" type="file" :accept="imgCropperData.accept" ref="inputer" @change="handleFile">
<Button type="ghost" class="myCropper-btn" @click="btnClick">选择图片</Button>
<Button type="primary" class="myCropper-btn" :loading="cropperLoading" @click="crop_ok">确认</Button>
</p>
</p>
</template>
<script>
var ezjsUtil = Vue.ezjsUtil;
import Bus from './bus/bus.js'
export default {
components: { Bus },
props: {
imgType: {
type: String
},
proportionX: {
type: Number
},
proportionY: {
type: Number
}
},
data () {
return {
imgCropperData: {
accept: 'image/gif, image/jpeg, image/png, image/bmp',
maxSize: 5242880,
file: null, //上传的文件
imgSrc: '', //读取的img文件base数据流
imgUploadSrc: '', //裁剪之后的img文件base数据流
},
imgObj: null,
hasSelectImg: false,
cropperLoading: false,
isShort: false,
}
},
created: function () {
let _this = this;
},
mounted: function () {
let _this = this;
// 初始化预览区域
let maxWidthNum = Math.floor(300 / _this.proportionX);
let previewWidth = maxWidthNum * _this.proportionX;
let previewHeight = maxWidthNum * _this.proportionY;
if (previewWidth / previewHeight <= 1.7) {
previewWidth = previewWidth / 2;
previewHeight = previewHeight / 2;
_this.isShort = true;
}
// 设置最大预览容器的宽高
$('.myCropper-preview-1').css('width', previewWidth + 'px');
$('.myCropper-preview-1').css('height', previewHeight + 'px');
// 设置中等预览容器的宽高
$('.myCropper-container .myCropper-preview .myCropper-preview-2').css('width',( previewWidth / 2) + 'px');
$('.myCropper-container .myCropper-preview .myCropper-preview-2').css('height', (previewHeight / 2) + 'px');
// 设置最小预览容器的宽高
$('.myCropper-container .myCropper-preview .myCropper-preview-3').css('width',( previewWidth / 4) + 'px');
$('.myCropper-container .myCropper-preview .myCropper-preview-3').css('height', (previewHeight / 4) + 'px');
},
methods: {
// 点击选择图片
btnClick () {
let _this = this;
// 模拟input点击选择文件
document.getElementById('myCropper-input').click();
},
// 选择之后的回调
handleFile (e) {
let _this = this;
let inputDOM = this.$refs.inputer;
// 通过DOM取文件数据
_this.file = inputDOM.files[0];
// 判断文件格式
if (_this.imgCropperData.accept.indexOf(_this.file.type) == -1) {
_this.$Modal.error({
title: '格式错误',
content: '您选择的图片格式不正确！'
});
return;
}
// 判断文件大小
if (_this.file.size > 5242880) {
_this.$Modal.error({
title: '超出',
content: '您选择的图片过大，请选择5MB以内的图片！'
});
return;
}
var reader = new FileReader();
// 将图片将转成 base 格式
reader.readAsDataURL(_this.file);
reader.onload = function () {
_this.imgCropperData.imgSrc = this.result;
_this.initCropper();
}
},
// 初始化剪切
initCropper () {
let _this = this;
// 初始化裁剪区域
_this.imgObj = $('');
let $avatarPreview = $('.avatar-preview');
$('#myCropper-workspace').empty().html(_this.imgObj);
_this.imgObj.cropper({
aspectRatio: _this.proportionX / _this.proportionY,
preview: $avatarPreview,
crop: function(e) {
}
});
_this.hasSelectImg = true;
},
// 确认
crop_ok () {
let _this = this, imgToken = null, imgBaseData = null;
// 判断是否选择图片
if (_this.hasSelectImg == false) {
_this.$Modal.error({
title: '裁剪失败',
content: '请选择图片，然后进行裁剪操作！'
});
return false;
}
// 确认按钮不可用
_this.cropperLoading = true;
let $imgData = _this.imgObj.cropper('getCroppedCanvas')
imgBaseData = $imgData.toDataURL('image/png');
// 构造上传图片的数据
let formData = new FormData();
// 截取字符串
let photoType = imgBaseData.substring(imgBaseData.indexOf(",") + 1);
//进制转换
const btoBlob = (bData, contentType = '', sliceSize = 512) => {
const byteCharacters = atob(bData);
const byteArrays = [];
for(let offset = 0; offset < byteCharacters.length; offset += sliceSize) {
const slice = byteCharacters.slice(offset, offset + sliceSize);
const byteNumbers = new Array(slice.length);
for(let i = 0; i < slice.length; i++) {
byteNumbers[i] = slice.charCodeAt(i);
}
const byteArray = new Uint8Array(byteNumbers);
byteArrays.push(byteArray);
}
const blob = new Blob(byteArrays, {
type: contentType
});
return blob;
}
const contentType = 'image/jepg';
const bData2 = photoType;
const blob = btoBlob(bData2, contentType);
formData.append("file", blob, "client-camera-photo.png")
formData.append("type", _this.imgType)
// ajax上传
$.ajax({
url: _this.$nfs.uploadUrl,
method: 'POST',
data: formData,
// 默认为true，设为false后直到ajax请求结束(调完回掉函数)后才会执行$.ajax(...)后面的代码
async: false,
// 下面三个，因为直接使用FormData作为数据，contentType会自动设置，也不需要jquery做进一步的数据处理(序列化)。
cache: false,
contentType: false,
processData: false,
type: _this.imgType,
success: function(res) {
let imgToken = res.data.token;
_this.cropperLoading = false;
// 传参
Bus.$emit('getTarget', imgToken);
},
error: function(error) {
_this.cropperLoading = false;
_this.$Modal.error({
title: '系统错误',
content: '请重新裁剪图片进行上传！'
});
}
});
},
}
}
</script>
<style lang="less" scoped>
.myCropper-container {
height: 400px;
}
.myCropper-container #myCropper-input {
width: 0px;
height: 0px;
}
.myCropper-container #myCropper-workspace {
width: 500px;
height: 400px;
border: 1px solid #dddee1;
float: left;
}
// 裁剪图片未选择图片的提示文字
.myCropper-container #myCropper-workspace .myCropper-words{
text-align: center;
font-size: 18px;
padding-top: 180px;
}
// 裁剪图片的预览区域
.myCropper-container .myCropper-preview-long {
width: 300px;
}
.myCropper-container .myCropper-preview-short {
width: 200px;
}
.myCropper-container .myCropper-preview {
float: left;
height: 400px;
margin-left: 10px;
}
.myCropper-container .myCropper-preview .myCropper-preview-1 {
border-radius: 5px;
overflow: hidden;
border: 1px solid #dddee1;
box-shadow: 3px 3px 3px #dddee1;
img {
width: 100%;
height: 100%;
}
}
.myCropper-container .myCropper-preview .myCropper-preview-2 {
margin-top: 20px;
border-radius: 5px;
overflow: hidden;
border: 1px solid #dddee1;
box-shadow: 3px 3px 3px #dddee1;
img {
width: 100%;
height: 100%;
}
}
.myCropper-container .myCropper-preview .myCropper-preview-3 {
margin-top: 20px;
border-radius: 5px;
overflow: hidden;
border: 1px solid #dddee1;
box-shadow: 3px 3px 3px #dddee1;
img {
width: 100%;
height: 100%;
}
}
// 按钮
.myCropper-btn {
float: left;
margin-top: 20px;
margin-right: 10px;
}
</style>下载本文