如何做团购网站中的美食地处地图功能/杭州seo网络公司

由于业务需求，最近研究localStorage、indexedDB等如何跨域进行CRUD管理，经过一番研究，封装了如下代码并做个笔记

环境

• vue: ^3.3.4

实战

发送端(即触发站点)

在App.vue中引入CrossDomainStorage组件(后面有实现过程)

<script setup>
import { ref } from 'vue'
import CrossDomainStorage from "@/components/CrossDomainStorage/index.vue";
const crossDomainStorageRef = ref(null)function sendTest() {if (crossDomainStorageRef.value){crossDomainStorageRef.value.sendMessage("getItem", {key:'APP_THEME_SCREEN'})}
}
</script><template><div><button @click="sendTest">测试</button><CrossDomainStorage :src="'http://xxxx.xxx/'" ref="crossDomainStorageRef"/></div>
</template>

接收端(即目标站点)

为了方便直接在App.vue中实践

<script setup>
import ParentMsgListener from '@/utils/parentMsgListener'const parentMsgListener = new ParentMsgListener()
parentMsgListener.addPermissionModule({ // 设置权限key对应处理方法localStorage: {setItem: localStorage.setItem,getItem: localStorage.getItem,},asyncTest: {text: async ()=> await 'asyncValue',text2: () => 'testValue',}
});
parentMsgListener.addPermission([ // 设置可操作的对象列表'localStorage'
])
parentMsgListener.start();
</script>

实现代码

CrossDomainStorage组件

<script setup lang="ts">
import {ref, reactive, onMounted} from 'vue';defineOptions({name: 'CrossDomainStorage'
});const iframeRef = ref();
const emit = defineEmits(['onLoad','response'])
const props = defineProps({src: {type: String, default:()=>"", required:true}
});
const status = ref(false)
const iframeStyles = reactive({position: 'fixed',top:0,left:0,width: 0,height: 0,zIndex:-1
});window.addEventListener('message', function (e) {if (e.data && e.data.request){console.log('[发送端]从iframe获取数据', e.data)emit('response', e.data||null)}
});function sendMessage(method: string, param: object, key: string) {if (status.value===false)return;key = key?key:'localStorage'if (iframeRef?.value){const iframeNode = iframeRef.value.contentWindow;let request = {key, method, param}console.log('[发送端]向iframe发送request:', request)setTimeout(function () {iframeNode.postMessage(request, '*')}, 500)}
}defineExpose({sendMessage: (method: string, param: object, key: string)=>sendMessage(method, param, key)
})onMounted(()=>{if (!!iframeRef.value && !!iframeRef.value.contentWindow){iframeRef.value.onload = function () {status.value = true;emit('onLoad', true)}}
})
</script><template><iframe ref="iframeRef" :src="props.src":style="iframeStyles"frameborder="0"scrolling="no"/>
</template>

parentMsgListener.ts封装消息管理类

// src/utils/parentMsgListener.ts
const messageLog = function (log, ...arg){arg.unshift(`[接收端]`, log)console.log.apply(console, arg)
}interface permissionOptions {key: string[],module: object
}/*** 监听响应拦截** @param {object}   e          接收数据* @param {array}   permission 权限列表* @param {function} response   接收回调** @return {void}*/
const listenerResponse = async function (e, permission: permissionOptions, response) {if (e.data && !!e.data.key && permission.key.includes(e.data.key)){let result = undefined;let lib = permission.module[e.data.key] || undefined;let method = e.data?.method || '';let param  = e.data?.param||{};if (!!lib){let _param = [];for (let key in param){_param.push(`'${param[key]}'`)}try { // 调用非js内置方法且兼容异步调用处理方法result = await ((lib[method]).apply(lib[method], Object.values(param)));}catch (error) { // 调用js内置方法result = eval(`${e.data.key}.${method}(${_param.join(',')})`);}}messageLog('response:', result)response({request: e.data,response: result}, '*')}
}class ParentMsgListener {/*** 消息调用权限对应处理* @var {object}*/private permissionMap = {};/*** 消息允许调用权限* @var {string[]}*/private permission = []constructor(permission) {if (permission && permission.length>0){this.addPermission(permission)}}/*** 添加授权权限key对应处理模块** @param {string|object} name 权限key* @param {function} fn 权限key处理方法** @return this*/addPermissionModule(name:string|object, fn){if (!fn && typeof name === 'object'){ // 批量导入for (let moduleKey in name){this.addPermissionModule.call(this, moduleKey, name[moduleKey]);}}else if(typeof name === 'string' && !!fn) { // 逐个导入this.permissionMap[name] = fn;}return this;}/*** 添加授权权限** @param {string|string[]} permissionKey 权限key** @return this*/addPermission(permissionKey: string|string[]){if (permissionKey instanceof Array){let that = this;permissionKey.forEach((key)=>{that.permission.push(key)})}else{this.permission.push(permissionKey)}return this;}/*** 发送消息** @param {object} message      发送内容* @param {string} targetOrigin 默认：*** @return {void}*/sendMessage(message:any, targetOrigin:string = '*'){messageLog('发送消息', message)window.parent.postMessage(message, targetOrigin)}/*** 启动监听*/start(){window.addEventListener('message',(e)=>listenerResponse(e, {key: this.permission,module: this.permissionMap}, this.sendMessage))}
}export default ParentMsgListener