先定义变量保存：placeSearch 如下：

return {
        form: {},
        query: {},
        loading: true,
        page: {
          pageSize: 10,
          currentPage: 1,
          total: 0
        },
        placeSearch: '',
        selectionList: [],

在提交搜索时，保存当前的关键字，如下：

onLoad(page, params = {}) {
        this.loading = true;
///保存当前变量        this.placeSearch=params.placeSearch;
        getList(page.currentPage, page.pageSize, Object.assign(params, this.query)).then(res => {
          const data = res.data.data;
          this.page.total = data.total;
          this.data = data.records;
          this.loading = false;
          this.selectionClear();
        });
      },

在column里，定义为html:true, 然后把关键字代替，如下所示：

{
              label: "暂住地派出所",
              prop: "zanzhudipaichusuo",
              //search: true, 
              html:true,
              formatter:(val)=>{     
                if(this.placeSearch!=''){
                  //console.log(this.placeSearch);
                  return val.zanzhudipaichusuo.replace(this.placeSearch, '<font color="red">' + this.placeSearch + '</font>')
                }else{
                  return val.zanzhudipaichusuo
                }
              },
              rules: [{
                required: false,
                message: "请输入暂住地派出所",
                trigger: "blur"
              }]
            },