封面图，基于创客贴在线制作
目录结构
这是《基于nuxt和iview搭建OM后台管理系统实践》这一个系列文章的目录，大致思路如下：
自行开发的公共组件，富文本quill[已完成]、地图、上传组件的封装过程
项目上线流程，自动化打包（Jenkins）
项目总结，总结开发过程中的坑点，避免以后再掉坑
前言
上一篇记录了quill富文本的封装过程，这一篇开始讲解上传组件（七牛、阿里云oss）的封装。
看东西
如动图所示，为上传组件演示，可以看到组件有上传、预览、删除重新上传、文件大小校验等功能。
上传组件演示
阿里oss上传组件实现过程
实现原理：用input[type='file']标签，并绑定一个change事件实现选择本地电脑文件操作，同时通过其他button触发input的change事件，最终与阿里oss进行交互实现上传图片的功能。
步骤1:引入阿里云osssdk代码，需要注意的是：框架使用的nuxt，引入sdk需要按照nuxt的规范在head方法里引入，附上head方法使用文档地址；
// 文件 components/upload.vue<template><!--省略业务代码--></template><script>export default { head: { script: [{ src: "http://gosspublic.alicdn.com/aliyun-oss-sdk.min.js" }]//引入sdk
},
<script><style>/*省略样式代码*/</style>步骤2:获取上传token，后端提供接口，因token有时效性故每次上传操作时需向后端请求；
// 文件 components/upload.vue<template><!--省略业务代码--></template><script>import axios from "~/plugins/axios";export default { head: { script: [{ src: "http://gosspublic.alicdn.com/aliyun-oss-sdk.min.js" }]//引入sdk
}, method:{
doUpload() { const _this = this; const urls = []; this.loading = true;
axios.get("/api/m/common/oss/getproperties")
.then(res=>{ //向后端请求获取oss token等信息
_this.ossKey.AccessKeyId = res.data.data.AccessKeyId;
_this.ossKey.AccessKeySecret = res.data.data.AccessKeySecret;
_this.ossKey.BucketName = res.data.data.BucketName;
_this.ossKey.SecurityToken = res.data.data.SecurityToken;
//与阿里oss交互，上传文件到服务器并返回文件路径
})
}
}
<script><style>/*省略样式代码*/</style>步骤3:与阿里oss交互，上传文件到服务器并返回文件路径；
//postOss(){ const _this = this; const client = new window.OSS.Wrapper({ region: _this.region, accessKeyId: _this.ossKey.AccessKeyId, accessKeySecret: _this.ossKey.AccessKeySecret, stsToken: _this.ossKey.SecurityToken, bucket: _this.ossKey.BucketName
});
_this.percentage = 0; const files = document.getElementById(_this.id); if(files.files[0].size > _this.limitSize){//对文件大小进行校验超出弹出提示框
_this.$Notice.warning({ title: '温馨提示', desc: '文件超出'+_this.limitSize/1024+'kb限制，请压缩一下图片再上传'
});
_this.loading = false; return false;
} if (files.files) { const fileLen = document.getElementById(_this.id).files; let resultUpload = ""; for (let i = 0; i < fileLen.length; i++) { const file = fileLen[i]; // 随机命名
let random_name ="mapOm/" + random_string(6) + "_" + new Date().getTime() + "." + file.name.split(".").pop(); // 上传
client.multipartUpload(random_name, file, { progress: function*(percentage, cpt) { // 上传进度
_this.percentage = percentage;
}
})
.then(results => { // 上传完成
_this.loading = false;
_this.show = true; const url = "http://sinochem-agri-fr.oss-cn-beijing.aliyuncs.com/" + results.name;
_this.url = url;
_this.$emit('uploadedUrl',results.name);//把url传给父组件
})
.catch(err => {
_this.loading = false; console.log(err);
});
}
}
}步骤4:引用并使用组件；
import uploadImg from '~/components/upload';//引入组件<upload-img label="土壤温度" id="soilTemperature" @uploadedUrl="(url) => this.formItem.trend.soilTemperature = url" @remove="() => this.formItem.trend.soilTemperature = ''"></upload-img>
阿里oss上传组件完整代码
<template>
<FormItem :label="label">
<template v-if="!edit">
<input :id="id" ref="input" @change="doUpload" class="file" type="file">
<div class="demo-upload-list" v-if="show">
<img :id="'img_'+id" :src="url" width="50px" height="50px">
<div class="demo-upload-list-cover">
<Icon type="ios-eye-outline" @click.native="handleView"></Icon>
<Icon type="ios-trash-outline" @click.native="handleRemove"></Icon>
</div>
</div>
<Button v-if="!show" :loading="loading" type="ghost" icon="ios-cloud-upload-outline" @click="upload">{{placeholder}}</Button>
<Modal :title="label+'预览'" v-model="visible">
<img :src="url" v-if="visible" style="width:100%;height:auto;">
</Modal>
</template>
<!-- 预览 -->
<template v-else>
<div class="demo-upload-list">
<img :id="'img_'+id" :src="editUrl" width="50px" height="50px">
<div class="demo-upload-list-cover">
<Icon type="ios-eye-outline" @click.native="handleView"></Icon>
<Icon type="ios-trash-outline" @click.native="handleRemove"></Icon>
</div>
</div>
<Modal :title="label+'预览'" v-model="visible">
<img :src="editUrl" v-if="visible" style="width:100%;height:auto;">
</Modal>
</template>
</FormItem></template><script>import axios from "～/plugins/axios";import { random_string } from "～/lib/utils";export default { head: { script: [{ src: "http://gosspublic.alicdn.com/aliyun-oss-sdk.min.js" }]
}, props: { editUrl: { default: ""
}, showUploadList: { type: Boolean, default: true
}, action: { default: ""
}, label: { default: "上传组件"
}, placeholder: { default: "上传图表"
}, id: { default: "upload"
}, limitSize: { default: 102400
}
}, name: "upload",
data() { return { loading: false, visible: false, show: false, region: "oss-cn-beijing", percentage: 0, url: "", urls: [], fileList: [], ossKey: {}, edit: false
};
},
created() {},
mounted() {}, methods: {
doUpload() { const _this = this; const urls = []; this.loading = true;
axios
.get("/api/getproperties")
.then(res => {
_this.ossKey.AccessKeyId = res.data.data.AccessKeyId;
_this.ossKey.AccessKeySecret = res.data.data.AccessKeySecret;
_this.ossKey.BucketName = res.data.data.BucketName; // _this.ossKey.Endpoint = res.data.data.Endpoint;
_this.ossKey.SecurityToken = res.data.data.SecurityToken; //上传
const client = new window.OSS.Wrapper({ region: _this.region, accessKeyId: _this.ossKey.AccessKeyId, accessKeySecret: _this.ossKey.AccessKeySecret, stsToken: _this.ossKey.SecurityToken, bucket: _this.ossKey.BucketName
});
_this.percentage = 0; const files = document.getElementById(_this.id); if (files.files[0].size > _this.limitSize) {
_this.$Notice.warning({ title: "温馨提示", desc: "文件超出" +
_this.limitSize / 1024 + "kb限制，请压缩一下图片再上传"
});
_this.loading = false; return false;
} if (files.files) { const fileLen = document.getElementById(_this.id).files; let resultUpload = ""; for (let i = 0; i < fileLen.length; i++) { const file = fileLen[i]; // 随机命名
let random_name = "mapOm/" +
random_string(6) + "_" + new Date().getTime() + "." +
file.name.split(".").pop(); // 上传
client
.multipartUpload(random_name, file, { progress: function*(percentage, cpt) { // 上传进度
_this.percentage = percentage;
}
})
.then(results => { // 上传完成
_this.loading = false;
_this.show = true; const url = "http://sinochem-agri-fr.oss-cn-beijing.aliyuncs.com/" +
results.name;
_this.url = url;
_this.$emit("uploadedUrl", results.name); //把url传给父组件
})
.catch(err => {
_this.loading = false; console.log(err);
});
}
}
})
.catch(errro => { this.$Notice.error({ title: "温馨提示", desc: "网络请求失败，请稍后再试"
});
_this.loading = false; console.log(errro);
});
},
upload() { var av = document.getElementById(this.id);
av.click();
},
handleView() { //预览
this.visible = true;
},
handleRemove() { //删除图片
const _this = this; if (_this.edit == true) {
_this.edit = false;
_this.$emit("remove");
} else {
_this.visible = false;
_this.show = false;
_this.$emit("remove");
}
}
}, watch: {
url(val) { if (val) { this.urls.push(val);
}
},
editUrl() { if (this.editUrl != null && this.editUrl != "") { this.edit = true;
}
}
}
};</script><style scoped>.file { display: none;
}.demo-upload-list { display: inline-block; width: 60px; height: 60px; text-align: center; line-height: 60px; border: 1px solid transparent; border-radius: 4px; overflow: hidden; background: #fff; position: relative; box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2); margin-right: 4px;
}.demo-upload-list img { width: 100%; height: 100%;
}.demo-upload-list-cover { display: none; position: absolute; top: 0; bottom: 0; left: 0; right: 0; background: rgba(0, 0, 0, 0.6);
}.demo-upload-list:hover .demo-upload-list-cover { display: block;
}.demo-upload-list-cover i { color: #fff; font-size: 20px; cursor: pointer; margin: 0 2px;
}</style>总结
iview官方提供了一个上传组件，但是不符合我们实际需求，我查看了源码并在此基础上进行了二次封装最终实现了需求。现在再回过头去看写的代码发现有点乱，后续抽空会进行代码优化。同时要吐槽下阿里oss文档，都没有一个demo让开发者查看，显得很不友好。
作者：愿爱无忧dk_
链接：https://www.jianshu.com/p/3714417697fb
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