实现结果

 html：

 <div class="searchBox">
        <span class="bt">标&#8195&#8195题</span>
        <div class="search">
            <div class="shuru">
                <!-- <span class="title">生产经营</span> -->
                <input type="请输入要查询的内容" v-model="searchText" @@keydown.enter="getSearch('btn')">
            </div>
            <div class="btn" @click="getSearch('btn')">
                <img src="../../assets/wyc/search.png" alt="">
            </div>
        </div>
    </div> 



<span v-html="brightenKeyword(el.filename,searchText)"></span>

搜索框样式：

.searchBox {
    height: 70px;
    display: flex;
    align-items: center;

    .bt {
        font-family: 'pf';
        font-size: 18px;
        color: #000;
        font-weight: 400;
        margin-right: 45px;
    }

    .search {
        width: 756px;
        height: 46px;
        display: flex;
        position: relative;

        .shuru {
            width: 680px;
            height: 46px;
            background: #FFFFFF;
            border: 1px solid rgba(12, 174, 149, 1);
            border-radius: 8px 0px 0px 8px;
            box-sizing: border-box;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;

            .bt {
                white-space: nowrap;
                display: inline-block;
            }

            .title {
                font-family: 'pf';
                font-size: 16px;
                color: #333333;
                font-weight: 400;
                padding-right: 7px;
                white-space: nowrap;
                border-right: 1px solid #D8D8D8;
                margin-right: 12px;
            }

            input {
                width: 99%;
                height: 34px;
                box-sizing: border-box;
                border: none;
                outline: none;
                font-family: 'pf';
                font-size: 16px;
                color: #333333;
                font-weight: 400;
                white-space: nowrap;
            }

        }

        .btn {
            width: 78px;
            height: 46px;
            background: #0CAE95;
            border-radius: 0px 8px 8px 0px;
            display: flex;
            align-items: center;
            justify-content: center;

            img {
                width: 22px;
                height: 22px;
            }
        }

        .tips {
            width: 274px;
            display: flex;
            // align-items: center;
            position: absolute;
            right: -280px;
            top: 50%;
            transform: translateY(-50%);

            img {
                width: 18px;
                height: 18px;

            }

            span {
                font-family: 'pf';
                font-size: 12px;
                color: #7a7a7a;
                font-weight: 400;
                white-space: wrap;
                margin-left: 3px;
                display: none;
            }

            &:hover {
                span {
                    display: block;
                }
            }
        }
    }
}

JavaScript： 

    data: () => ({
        searchText: '',
    }),

        //搜索内容的数据
        async getSearch(val) {
            console.log(val, this.searchText);
            this.$nextTick(()=>{
                this.getIsmDatas()
            })
        },
        //获取需要标红的文字
        getRedWords(contentText, keyword) {
            let keywordArray = keyword.split(" ");
            console.log(keywordArray, '有空格的字...');
            let wordsArray = [];
            for (let key of keywordArray) {
                if (contentText.includes(key)) {
                    wordsArray.push(key)
                }
            }
            // this.changeRedText(contentText,wordsArray)
            return wordsArray;
        },
        //将文字标红
        brightenKeyword(contentText, keyword) {
            // debugger
            var res = contentText
            // keyword = keyword.replace("+",'')
            var judgeFn = new RegExp(/\s+/g); //空格的正则
            //有加号的时候
            if (keyword.includes('+')) {
                //    const Reg = new RegExp("+", 'g');
                keyword = keyword.replace("+", '')
            }
            //有空格的时候
            else if (judgeFn.test(keyword)) {
                console.log(keyword, "【结果】：内容包含有空格!");
                let wordsArray = this.getRedWords(contentText, keyword);
                for (let word of wordsArray) {
                    if (word != "") {
                        // 设定需要检索的模式
                        const Reg = new RegExp(word, 'g');
                        //替换每一个相同字
                        res = res.replace(Reg, `<span style="color: red; font-family: 'pfm';">${word}</span>`);
                    }
                }
                return res
            }
            // 判断标题中是否包含关键字
            if (contentText.includes(keyword)) {
                const Reg = new RegExp(keyword, 'g');
                res = res.replace(Reg, `<span style="color: red; font-family: 'pfm';">${keyword}</span>`);
            }
            return res; //此时的res里已经将需要标红的字体带上了格式（<span style="color:red"></span>）
        },
        //获取表格数据
        async getIsmDatas() {
            let res = await this.$http.get(`/ctrl/ismStudy/getIsmDatas?unitType=${this.unitType}&jobnature=${this.tabOption['code_value']}&jobnatureText=${this.tabOption['code_name']}&page=${this.PageInfo.pagenum}&limit=${this.PageInfo.pagesize}`)
            if (res && res.status == 200) {
                this.tableData.tbody = res.data.data.data
                this.PageInfo.total = res.data.data.count
            }
        },