利用popper-class实现选项框内容过长，截取显示功能：

<el-select popper-class="popper-class" :popper-append-to-body="false" v-model="value" placeholder="请选择"><el-optionv-for="item in options":key="item.value":label="item.label":value="item.value"><el-tooltipplacement="top":disabled="item.label.length<17"><div slot="content"><span>{{item.label}}</span></div><div class="iclass-text-ellipsis">{{ item.label }}</div></el-tooltip></el-option>
</el-select><script>export default {data() {return {options: [{value: '选项1',label: '黄金糕黄金糕黄金糕黄金糕黄金糕黄金糕黄金糕黄金糕黄金糕'}, {value: '选项2',label: '双皮奶双皮奶双皮奶双皮奶双皮奶双皮奶双皮奶双皮奶双皮奶'}, {value: '选项3',label: '蚵仔煎蚵仔煎蚵仔煎蚵仔煎蚵仔煎蚵仔煎蚵仔煎蚵仔煎蚵仔煎'}],value: ''}}}
</script><style scoped>
.el-select {width: 300px;
}
.el-select ::v-deep .popper-class {width: 300px;
}
.iclass-text-ellipsis {white-space: nowrap;overflow: hidden;text-overflow: ellipsis;
}
</style>

结果如下：