stream，做减法，优化搜索代码。

做一个搜索，三个输入条件，求这个条件的交集。起初我的思路是按照操作的流程，一步步的来做这三个筛选。

let searchResults = [];

//step1 根据id搜索，得到一个子集。

if (searchId) {

    //开始按照id查找，查找目标为allData

    let eds = allData;

    searchResults = this._searchWithId(searchId, eds);

    searchFlag = true;

}

if (searchTime) {

    //开始按照searchtime查找,如果searchFlag为true则查找目标为searchResults，否则为allData

    searchTime = Number(searchTime);

    if (searchFlag === true) {

        let srs = [];

        srs= this._searchWithMilliSeconds(searchId, searchResults );

        searchResults = srs;

    } else {

        let eds = allData;

        searchResults = this._searchWithMilliSeconds(searchId, eds);

    }

    searchFlag = true;

}

if (searchWords) {

    //开始按照searchwords查找,如果searchFlag为true则查找目标为searchResults，否则为allData

    if (searchFlag === true) {

        let srs = [];

        srs = this._searchWithKeyWord(searchId, searchResults );

        searchResults = srs;

    } else {

        let eds = allData;

        searchResults = this._searchWithKeyWord(searchId, eds);

    }

    searchFlag = true;

}

let result = searchDataStream;

经过某同事的帮助，采用做减法的思想，数据就像是流一样被filter掉。代码就被缩减了好多。主要是思路和经验，大家看看，细节请忽略

let searchDataStream = allData;

if (searchId) {

    //开始按照id查找，查找目标为_editLineDatas

    searchDataStream = this._searchWithId(searchId, searchDataStream);

}

if (searchTime) {

    //开始按照searchtime查找,如果searchFlag为true则查找目标为searchResults，否则为_editLineDatas

    searchTime = Number(searchTime);

    searchDataStream = this._searchWithMilliSeconds(searchTime, searchDataStream);

}

if (searchWords) {

    //开始按照searchwords查找,如果searchFlag为true则查找目标为searchResults，否则为_editLineDatas

    searchDataStream = this._searchWithKeyWord(searchWords, searchDataStream);

}

let result = searchDataStream;