node.js 数组添加不重复的值和判断数值是否在数组里

Bertha 。 2022-03-02 11:38 234阅读 0赞

**一、数组添加不重复的值**

1.处理不重复的封装方法

Array.prototype.excelAreaName =function(){
        for(var i=0; i < arguments.length; i++){
          var ele = arguments[i];
          if(this.indexOf(ele) == -1){
              this.push(ele);
          }
      }
    };

2.调用

let obj = ['海淀区'，'朝阳区','通州区','海淀区','朝阳区','通州区']
    let excelareaArr = [];
    for (var i= 0;i< obj.length; i++) { 
        excelareaArr.excelAreaName(obj[i])
    }

此时excelareaArr数组只有海淀区、朝阳区和通州区

注意：excelareaArr数组调用的excelAreaName要和封装的方法名称对应一致。

参考: [https://www.cnblogs.com/fanbi/p/9013415.html][https_www.cnblogs.com_fanbi_p_9013415.html]

--------------------

**二、判断数值是否在数组里**

1.封装的方法

function contains(arr, obj) {
        var i = arr.length;
        while (i--) {
            if (arr[i] === obj) {
                return true;
            }
        }
        return false;
    }

2.测试

let areaArr= ['海淀区'，'朝阳区','通州区']
    let areaName = '海淀区';
    if (contains(areaArr, areaName )) {
         console.log(areaName + '在areaArr数组里');
     } else {
         console.log(areaName + '不在areaArr数组里');
    }

--------------------

三、附上node项目的部分源码

'use strict';
    
    const conn = require('../../libs/Conn');
    const path = require('path');
    const fs = require('fs');
    const _ = require('underscore');
    const constarctCheck = require('./contractCheck');
    const XLSX = require('../../../services/import/XLSX');
    const exportXLSX = require('../../../services/export/PointSelectedXLSX');
    const contractAdd = require('../../actions/contract/contractAdd');
    //20190311
    const interUtil = require('../../libs/InterUtil').isChinseOrEnglish;
    
    //判断是否包含
    function contains(arr, obj) {
        var i = arr.length;
        while (i--) {
            if (arr[i] === obj) {
                return true;
            }
        }
        return false;
    }
    
    Array.prototype.excelAreaName =function(){
        for(var i=0; i < arguments.length; i++){
          var ele = arguments[i];
          if(this.indexOf(ele) == -1){
              this.push(ele);
          }
      }
    };　
    
    module.exports = async function (params) {
        try {
            //20190311
            let language_type = params.language_type;
            let col = await interUtil(language_type);
            let uploadFile = params.upload_file;
            let file = uploadFile.shift();
            let path = file.path; 
            let fileSplit = path.split('.');
            let fileType = fileSplit[fileSplit.length - 1];
            let obj = await XLSX(path);
            if (obj.length < 1) {
                return {success: false, message: col.not_exportdata};
            }
            obj.splice(0, 2);
            let areaSql = `SELECT area_name
                                FROM area_file 
                                WHERE parent = '${params.area_id}' 
                                AND delete_sign = 1`;
    
            /*--------------------进入重点-----------------------*/
            if (obj) {
                //excel中的区域数组
                let excelareaArr = [];
                obj.forEach(function (o) {
                    excelareaArr.excelAreaName(o.__EMPTY_4)
                 });
                 //获取此用户权限内的区域数组
                 let areas =  await conn(areaSql, []);
                 let areaArr = [];
                 areas.forEach(function (area, index) {
                    areaArr.push(area.area_name)
                 });
                 //判断excel中的数组都包含在权限数组areaArr中，若是可导入，否则不能导入。
                 for (var i= 0;i< excelareaArr.length; i++) { 
                    if (!contains(areaArr, excelareaArr[i])) {
                        return {message: '请导入用户符合权限的区域！'};
                    }
                 }
       
            }
             /*--------------------结束-----------------------*/
            let idsArr = _.map(obj, function (item) {
                return item[col.tikinmedia];
            });
            params.idsArr = idsArr;
            //.................
            return {success: true, fileName: params.fileName};
    
        } catch (e) {
            if (fs.existsSync(path)) fs.unlinkSync(path);
            throw e;
        }
    };

[https_www.cnblogs.com_fanbi_p_9013415.html]: https://www.cnblogs.com/fanbi/p/9013415.html