js判断文字超出两行...，并展示查看更多按钮_js判断字符串是否超过两行

HTML

<div class="card-content">
    <el-scrollbar style="height: 100%;">
        <ul class="card-box" v-if="warningData.length">
            <li class="card-cell" v-for="(item, index) in warningData" :key="index">
                <el-row type="flex" justify="end" v-if="item.isBeyond">
                    <span class="arrow-right" @click="item.isExpand = !item.isExpand">
                        {{item.isExpand ? '折叠详情' : '展开详情'}}
                    </span>
                </el-row>
                <el-row :class="['desc-row', {'ellipsisFont': item.isBeyond && !item.isExpand }]">
                    <div class="real-box">{{item.description}}</div>
                    <div class="virtually-box">{{item.description}}</div>
                </el-row>
            </li>
        </ul>
        <div v-else class="empty-txt">暂无数据</div>
    </el-scrollbar>
</div>
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JS

mounted(){
    this.$nextTick(() => {
        this.judgeHeight()
    })
    window.addEventListener('resize', () => {
        this.judgeHeight()
    })
},
methods: {
    judgeHeight(){
        if(this.warningData.length) {
            const ELArr = document.querySelectorAll('.card-content .virtually-box')
            let _transData = JSON.parse(JSON.stringify(this.warningData))
            _transData.forEach((item, index) => {
                item.isBeyond = false;
                item.isExpand = false;
                if(ELArr[index].clientHeight > 48){
                    item.isBeyond = true;
                }
            })
            this.warningData = JSON.parse(JSON.stringify(_transData))
        }
    }
}
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CSS

html {
    background-color: #efefef;
}
* {
    padding: 0;
    margin: 0;
}
.card-content {
    height: 600px;
    padding: 20px 30px;
    box-sizing: border-box;
}
.card-box {
    padding: 0;
}
.card-cell {
    background-color: #fff;
    list-style: none;
    padding: 15px 20px;
    border-radius: 6px;
}
.card-cell:not(:last-child) {
    margin-bottom: 15px;
}
.desc-row {
    height: auto;
    overflow: hidden;
    position: relative;
    color: #666;
    line-height: 24px;
}
.desc-row.ellipsisFont {
    height: 48px;
}
.ellipsisFont .real-box {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}
.virtually-box {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: -1;
}
.arrow-right {
    color: #5197E6;
    cursor: pointer;
    margin-bottom: 10px;
}
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效果图

点击展开详情