vue.js支持表情输入

先看效果图

代码

参考：
html元素contenteditable属性如何定位光标和设置光标

【JavaScript编程】Selection对象和Range对象

Range对象的方法

<template>
    <div class="emoji-container clearfix">

        <div class="input-area" ref="editableInputAreaDiv" contenteditable="true">
            halo world
            <img src="https://cdn.sunofbeaches.com/emoji/1.png" alt="">
        div>
        
        <div class="input-area-bar">
            <span class="emoji-txt" @click="emojiShow = !emojiShow">表情span>
            <span class="emoji-btn" @click="publish">发布span>
        div>
        
        <div class="emoji-item-container" v-show="true">
            <div class="emoji-item-area">
                <img v-for="(emoji, key) in 130" :key="key" @click="addEmoji(emoji)"
                    :src="'https://cdn.sunofbeaches.com/emoji/' + emoji + '.png'" alt="" />
            div>
        div>
    div>
template>

<script>
export default {
    name: "Emoji",
    data() {
        return {
            emojiShow: false,
            lastEditRange: null,
        }
    },
    mounted() {
        this.$refs['editableInputAreaDiv'].onclick = () => {
            // 获取选定对象
            let selection = window.getSelection()
            console.log(selection, selection.rangeCount, 'selection');
            // 设置最后光标对象
            if (selection.rangeCount > 0) {
                // 记录光标最后点击可编辑div中所选择的位置
                this.lastEditRange = selection.getRangeAt(0);
                console.log(selection.getRangeAt(0));
            }
        }
    },
    methods: {
        publish() {
            this.$refs['editableInputAreaDiv'].focus()
            let selection = window.getSelection()

        },
        addEmoji(emoji) {
            let edit = this.$refs['editableInputAreaDiv']

            edit.focus()
            let selection = window.getSelection()
            // 如果存在最后的光标对象
            if (this.lastEditRange) {
                console.log('last');
                // 选区对象清除所有光标
                selection.removeAllRanges();
                // 并添加最后记录的光标，以还原之前的状态
                selection.addRange(this.lastEditRange);

                // 创建表情图
                let img = document.createElement('img');
                img.src = 'https://cdn.sunofbeaches.com/emoji/' + emoji + '.png';
                console.log(img);
                /*
                // 也可以这样创建img 
                let image = new Image();
                image.src = 'https://cdn.sunofbeaches.com/emoji/' + emoji + '.png'; */

                // 获取到最后选择的位置
                var range = selection.getRangeAt(0);

                // 在此位置插入表情图
                range.insertNode(img)
                // range.insertNode(image) // 或者这样插入

                // false，表示将Range对象所代表的区域的起点移动到终点处
                range.collapse(false)

                // 记录最后的位置
                this.lastEditRange = selection.getRangeAt(0);
            } else {
                console.log('new')
                // 创建一个img标签（表情）
                let img = document.createElement('img');
                img.src = 'https://cdn.sunofbeaches.com/emoji/' + emoji + '.png';
                console.log(img);
                // 将表情添加到可编辑的div中，作为可编辑div的子节点
                edit.appendChild(img)
                // 使用选取对象，选取可编辑div中的所有子节点
                selection.selectAllChildren(edit)
                // 合并到最后面，即实现了添加一个表情后，把光标移到最后面
                selection.collapseToEnd()
                return
            }


        }
    }
}
script>

<style scoped lang="scss">
.emoji-container {
    width: 400px;
    height: 160px;
    margin: 10px auto;
    border-radius: 5px;
    padding: 10px;

    background-color: #fff;

    ::v-deep .input-area {
        height: 100px;
        border: 1px solid #e9e9e9;
        outline: none;
        padding: 10px;
        font-size: 16px;
        overflow-y: scroll;

        &:focus {
            border: 1px solid red;
        }

        img {
            width: 20px;
            height: 20px;
            vertical-align: bottom;
            margin: 0 2px;

        }
    }

    .input-area-bar {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin: 10px 5px;
        line-height: 20px;
        height: 30px;

        .emoji-txt {
            color: #4485f9;
            cursor: pointer;
        }


        .emoji-btn {
            background-color: #4485f9;
            cursor: pointer;
            padding: 0px 10px;
            color: #fff;
            height: 100%;
            line-height: 28px;
            border-radius: 5px;
        }
    }
}

.emoji-item-container {
    background-color: #fff;
    height: 200px;
    border-radius: 5px;
    padding: 5px;
    overflow-y: auto;
    margin-top: 14px;
    box-shadow: 0 0 5px 5px rgba(0, 0, 0, .028);

    .emoji-item-area {

        img {
            cursor: pointer;
            width: 20px;
            height: 20px;
            margin: 2px;
            padding: 9px;
            border-radius: 8px;
            vertical-align: bottom;
            transition: all .28s;

            &:hover {
                transform: scale(1.2);
            }

            &:hover {
                background-color: #eaeaea;
            }
        }
    }

}

.clearfix::before,
.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

::-webkit-scrollbar {
    width: 4px;
}

::-webkit-scrollbar-thumb {
    border-radius: 10px;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.12);
    background: rgba(0, 0, 0, 0.2);
}

/*::-webkit-scrollbar-track {
        box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
        border-radius: 10px;
        background: rgba(0,0,0,0.1);
    }*/
style>