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parent.html

<p id="app">
    <input type="text" v-model="item.name" />
    <input type="checkbox" v-model="item.check" />
    <input type="date" v-model="item.date" />
    <iframe ref="iframe" src="child.html" @load="load"></iframe>
</p>

<script src="http://cdn.bootcss.com/vue/2.1.8/vue.min.js"></script>

<script>
    window.app = new Vue({
        el: '#app',
        data() {
            return {
                item: {
                    name: null,
                    check: false,
                    date: null,
                },
            }
        },
        methods: {
            load: function (item) {
                const app = this.$refs.iframe.contentWindow.app;

                if (app && app.setContent) {
                    app.setContent(this.item)
                }
                else {
                    window._item = this.item
                }
            }
        }
    })
</script>

child.html

<p id="app">
    {{ item }}
</p>

<script src="http://cdn.bootcss.com/vue/2.1.8/vue.min.js"></script>

<script>
    window.app = new Vue({
        el: '#app',
        data() {
            return {
                item: null,
            }
        },
        created: function () {
            this.setContent(window.parent.window._item);
        },
        methods: {
            setContent: function (item) {
                this.item = item;
            }
        }
    })
</script>

Or pass the vuex store to use the same store for the vue instances of the two pages

If you use iframe, you can only use websocket to notify of updates. The two-way data of vue and ag can only be updated in real time on the same page

iframe is cross-page. It is extremely unsafe and impossible for others to use ng or vue to operate your page.

You can try postMessage.