我把它写成了组件

主要代码是

document.getElementById(this.FullScreenId).scrollTop = document.getElementById(this.FullScreenId).scrollHeight

我这边把div满屏了看下面css就知道了

你也可以使用body，这个你行百度一下就可以了

注意点是css

/* 页面满屏 */
.pageFullScreen {
    height: 100%;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    overflow: auto;
}

父组件

<style>
</style>
<template>
    <div id="testFullScreenId" class="pageFullScreen">
        <div style="height: 500px; background-color: #eee;overflow-y: scroll;-webkit-overflow-scrolling: touch;"></div>
         <inputList type="test" @inputListClick="inputListClick" FullScreenId="testFullScreenId" v-model="inputVal" @inputListFocus="focus" @inputListBlur="blur"></inputList>
         <br />
         <button @click="sub">获取input值</button>
         <br />
          <inputList type="test" @inputListClick="inputListClick" FullScreenId="testFullScreenId" v-model="inputVal" @inputListFocus="focus" @inputListBlur="blur"></inputList>
    </div>
</template>
<script>
    import inputList from '../../components/input' // input
    export default {
        components: {
            inputList
        },
        data() {
            return {
                imagesUrl: { // 排版图片使用懒加载
                },
                inputVal: ''
            }
        },
        created() {
        },
        mounted() {
        },
        methods: {
            focus(e) {
                console.log(e)
            },
            blur(e) {
                console.log(e)
            },
            inputListClick(e) {
                console.log(e)
            },
            sub() {
                alert(this.inputVal)
                console.log(this.inputVal)
            }
        }
    }
</script>

子组件

<style>
.inputList {}
</style>
<template>
    <!-- 父组件使用v-model发送input事件就可以接收到了 -->
    <div class="inputList">
        <input :type="type" @click="inputListClick($event)" @input="inputListInput($event)" @focus="inputListFocus($event)" @blur="inputListBlur($event)">
    </div>
</template>
<script>
    export default {
        name: 'inputList',
        props: {
            type: { // 文本框类型
                type: String,
                default: 'text'
            },
            FullScreenId: { // 文本框被键盘遮住
                type: String,
                default: ''
            }
        },
        data() {
            return {
                imagesUrl: { // 排版图片使用懒加载
                },
                pageHeightOne: '', // 页面高度
                pageHeightTow: ''
            }
        },
        created() {
        },
        mounted() {
            // window.onresize监听页面高度的变化
            window.onresize = () => {
                return (() => {
                    // window.scroll(0, 0) // 滚到顶部
                    document.getElementById(this.FullScreenId).scrollTop = document.getElementById(this.FullScreenId).scrollHeight
                })()
            }
        },
        methods: {
            // 键盘输入
            inputListInput(e) {
                if (typeof e.target.value === 'string') {
                    if (/[\u4e00-\u9fa5]/.test(e.target.value)) {
                        e.target.value = ''
                    } else {
                        // console.log('合格')
                    }
                } else {
                    console.log('数据类型不正确')
                }
                this.$emit('input', e.target.value)
            },
            // 获取焦点
            inputListFocus(e) {
                // console.log(e)
                this.$emit('inputListFocus', 'focus')
            },
            // 失去焦点
            inputListBlur(e) {
                // console.log(e)
                this.$emit('inputListBlur', 'blur')
            },
            // 点击
            inputListClick(e) {
                this.$emit('inputListClick', 'click')
            }
        }
    }
</script>