摘要：前端對于數據的處理一般會用到等方法，下面逐次進行分析方法用于調用數組的每個元素，并將元素傳遞給回調函數。注意對于空數組是不會執行回調函數的。方法按照原始數組元素順序依次處理元素。

前端對于數據的處理一般會用到foreach、map、reduce、Object.values()、Object.keys()、Object.entries()等方法，下面逐次進行分析

foreach
forEach() 方法用于調用數組的每個元素，并將元素傳遞給回調函數。foreach方法不會返回執行結果。

注意: forEach() 對于空數組是不會執行回調函數的。foreach會改變原數組。

語法：
array.forEach(function(currentValue, index, arr), thisValue)

示例：
    let schedulesObj = {};
    dateArr.forEach((key) => {
      if (!schedulesObj[key]) {
        schedulesObj[key] = [];
      }
      schedulesObj[key].push(item);
    });

map
map() 方法返回一個新數組，數組中的元素為原始數組元素調用函數處理后的值。

map() 方法按照原始數組元素順序依次處理元素。

注意： map() 不會對空數組進行檢測。

注意： map() 不會改變原始數組。

語法：
array.map(function(currentValue,index,arr), thisValue)

示例：
    const initItems = initEvaluateItems.map(item => {
      const { score, id, itemName, levelDesc, maxLevel } = item;
      return {
        score,
        id,
        itemName,
        levelDesc,
        maxLevel
      };
    });

reduce
reduce() 方法接收一個函數作為累加器，數組中的每個值（從左到右）開始縮減，最終計算為一個值。

reduce() 可以作為一個高階函數，用于函數的 compose。

注意: reduce() 對于空數組是不會執行回調函數的。

語法：
array.reduce(function(total, currentValue, currentIndex, arr), initialValue)

示例：
let scheduleIdArray = Object.keys(curScheduleMonth).map(v => curScheduleMonth[v]).reduce((total, item) => {
    total = [...total, ...item];
    return total;
  }, []);

Object.keys()

Object.keys() 方法會返回一個由一個給定對象的自身可枚舉屬性組成的數組，數組中屬性名的排列順序和使用 for...in 循環遍歷該對象時返回的順序一致 。

語法：
Object.keys(obj)

示例：
var anObj = { 100: "a", 2: "b", 7: "c" };
console.log(Object.keys(anObj)); // console: ["2", "7", "100"]

Object.values()

Object.values()方法返回一個給定對象自身的所有可枚舉屬性值的數組，值的順序與使用for...in循環的順序相同 ( 區別在于 for-in 循環枚舉原型鏈中的屬性 )。

語法：
Object.values(obj)

示例：
var an_obj = { 100: "a", 2: "b", 7: "c" };
console.log(Object.values(an_obj)); // ["b", "c", "a"]

Object.entries()

Object.entries()方法返回一個給定對象自身可枚舉屬性的鍵值對數組，其排列與使用 for...in 循環遍歷該對象時返回的順序一致（區別在于 for-in 循環也枚舉原型鏈中的屬性）。

語法：
Object.entries(obj)

示例：
const anObj = { 100: "a", 2: "b", 7: "c" };
console.log(Object.entries(anObj)); // [ ["2", "b"], ["7", "c"], ["100", "a"] ]

1.時間相關

{
    "success":true,
    "code": "success",
    "message": "成功",
    "data": {
        "monthData":[
            {
               "month":"2018-05",
               "displayDesc":"有服務",
               "showType":"1",
               "tips":"請您選擇"
            }
        ]
        "calendarData":[
            {
               "date":["2018-06-02","2018-07-09"],
               "displayDesc":"有服務",
               "showType":"1",
               "tips":"請您評價"
            }
        ],
        "schedules":[
            {
               "scheduleId":"1",
               "appCode":"106",
               "appName":"公共服務",
               "cityId":"321568",
               "categoryCode":"16",
               "scheduleType":"1",
               "userDesc":"社區醫療",
               "systemDesc":"",
               "remind":"1",
               "repeat":"1",
               "status":"2",
               "serviceUrl":"",
               "beginTime":"2018-04-25",
               "endTime":"2018-04-26",
            }
        ]
    }
}

import moment from "moment/moment";

/**
 * 通過beginTime和endTime，將列表值按照天的維度進行整理，產出的數據結構scheduleByDay
 * @param schedules
 */
export function genSchedulesObj(schedules = []) {
  let schedulesObj = {};
  schedules.forEach((item) => {
    let { beginTime, endTime } = item;
    let _beginTime = new Date(beginTime).getTime();
    let _endTime = new Date(endTime).getTime();
    let dateArr = [];
    let dateReduce = ((_endTime - _beginTime) / (1000 * 24 * 60 * 60) + 1) || 1;
    dateReduce > 0 ? {} : (dateReduce = 0);
    for (let i = 0; i < dateReduce; i++) {
      dateArr.push(moment(_beginTime).format("YYYY-MM-DD"));
      _beginTime += (1000 * 24 * 3600);
    }
    dateArr.forEach((key) => {
      if (!schedulesObj[key]) {
        schedulesObj[key] = [];
      }
      schedulesObj[key].push(item);
    });
  });
  // let flag = true;
  // for (let key in schedulesObj) {
  //   for (let i = 0, len = schedulesObj[key].length; i < len; i++) {
  //     if (schedulesObj[key][i].status < 3) {
  //       flag = false;
  //       break;
  //     }
  //   }
  // }
  return {
    schedulesObj
  };
}

/**
 * calendarData 日期上顯示代辦內容，根據這個數據創建tagData是一個一維數組，產出的數據結構tagDataByMonth
 * @param calendarData
 */
export function genCalendarDataObj(calendarData = []) {
  let calendarDataObj = {};
  calendarData.forEach((item) => {
    item.date.forEach((key) => {
      if (!calendarDataObj[key]) {
        calendarDataObj[key] = [];
      }
      calendarDataObj[key].push({
        displayDesc: item.displayDesc,
        showType: item.showType
      });
    });
  });
  return calendarDataObj;
}
/**
 * 獲取當前月、上一個月、下一月及當前月的開始、結束日期
 */
export function getFormatMonth(currentDate) {
  const beginDate = moment(currentDate).startOf("month").add(-1, "M").format("YYYY-MM-DD");
  const endDate = moment(currentDate).endOf("month").add(1, "M").format("YYYY-MM-DD");
  const preMont = moment(currentDate).subtract(1, "months").format("YYYY-MM");
  const nextMont = moment(currentDate).add(1, "months").format("YYYY-MM");

  const currMont = moment(currentDate).format("YYYY-MM");

  const month = preMont + "," + currMont + "," + nextMont;

  return {
    beginDate,
    endDate,
    preMont,
    nextMont,
    currMont,
    month
  };
}

2.工具類函數

/**
 * 正則表達式獲取地址欄參數
 */

export const getURLParameters = (url) => {
  url = url.split("?")[1] || "";
  url = url.split("&");
  return url.reduce((total, item) => {
    let itemArr = item.split("=");
    total[itemArr[0]] = itemArr[1];
    return total;
  }, {});
};

/**
 * filter過濾
 */
const filterArr = (scheduleByDay[currentDate] || []).filter(v => {
    return v.status !== 4;
  });


const tagData = Object.keys(tagDataByMonth).map((key) => {
    const obj = tagDataByMonth[key][0];
    const scheduleByDayItem = scheduleByDay[key] || [];
    return {
      date: key,
      tag: scheduleByDayItem.length === 1 ? scheduleByDayItem[0].userDesc : obj.displayDesc,
      tagColor: obj.showType === "1" ? "#F5A623" : "#CCCCCC"
    };
  });

let scheduleIdArray = Object.keys(curScheduleMonth).map(v => curScheduleMonth[v]).reduce((total, item) => {
    total = [...total, ...item];
    return total;
  }, []);
  let scheduleId = scheduleIdArray.length ? scheduleIdArray[0].scheduleId : null;
  let isOnlyOne = scheduleId ? scheduleIdArray.every(v => v.scheduleId === scheduleId) : false;

/**
   * 獲取服務端時間
   */
  getServerTimeAsync() {
    return new Promise((resolve) => {
      try {
        my.call("getServerTime", (res) => {
          resolve(res.time);
        });
      } catch (e) {
        resolve(new Date().getTime());
      }
    });
  },
/**
   * 檢查文本域的長度
   * @param keyword
   * @returns {*}
   */
  checkKeywordLength(keyword) {
    const { maxlength } = this.data;
    if (keyword.length > maxlength) {
      keyword = keyword.substring(0, maxlength);
    }
    return keyword;
  },


const { data: { items: initEvaluateItems } } = serviceKey;
    const initItems = initEvaluateItems.map(item => {
      const { score, id, itemName, levelDesc, maxLevel } = item;
      return {
        score,
        id,
        itemName,
        levelDesc,
        maxLevel
      };
    });

3.層級較深的數據結構

{
    "success": true, 
    "value": {
        "merchant": {
            "id": 0, #物理id
            "partakerId": 0, 
            "partakerName": "string", 
            "merchantPid": "string",
            "merchantName": "string", 
            "owners": {
                "guarantee_owner":[{"account":"string","name":"string"}],
            }, #負責人      
        },
        "extension":{
            keyValues: {
                channel:{
                    key:{
                        id:"21",
                        creator:"流年",
                        dataSource:"",
                        key:"duration",
                        label:"項目周期",
                        type:"date",
                        isRequire:"Y"   
                    },
                    value:"2018-06-02 17:55:12"
                },
                is_sign:{
                    key:{
                        id:"32",
                        creator:"lily",
                        dataSource:"[{"key":"current","value":"今天"},{"key":"last","value":"昨天"}]",
                        key:"startTime",
                        label:"啟動時間",
                        type:"select",
                        isRequire:"N"   
                    },
                    value:"last"
                },
                merchantInfo:{
                    key:{
                        id:"02",
                        creator:"jack",
                        dataSource:"",
                        key:"taskCount",
                        label:"任務量",
                        type:"number",
                        isRequire:"Y"   
                    },
                    value:"55"
                },
                code:"DEFAULT",
                tempName:"社區服務"
            }
        }, #動態字段
        
    }, 
    "msg": "string", #錯誤信息
    "code": "string" #錯誤碼
}




const { stat, value = {}, msg } = response || {};
      if (stat === "fail") {
        message.error(msg);
      }
      const { merchant = {}, extension = {} } = value;
      const { keyValues = {} } = extension;
      const extenData = Object.entries(keyValues).map(v => {
        const [arr1, arr2] = v;
        const { key, recordId, value: newValue } = arr2;
        return {
          key,
          value: newValue,
          recordId
        };
      });
      console.log("動態數據-----", extenData);


const linksObj = {
  活動信息: links.slice(0, 2),
  活動商戶信息: links.slice(2, 8),
  保障商戶信息: links.slice(8),
};     
   
   
   getFormDataDom = (data) => {
        const { getFieldDecorator } = this.props.form;
        const { formItem = {} } = this.props;
        return data.map((val) => {
          const { name, id, isSelect = false, isSelectInputOwners = false, isInput = false } = val;
          let isSimpleInitial;
          let isSelectInputOwnersInitial;
          if (isSelect || isInput) {
            isSimpleInitial = formItem && formItem[id] ? formItem[id] : "";
          }
          if (isSelectInputOwners) {
            isSelectInputOwnersInitial = formItem && formItem[id] && formItem[id].length > 0 ? formItem[id].map(v => v.name) : [];
          }
          const initialValue = isSelectInputOwners ? isSelectInputOwnersInitial : isSelect || isInput ? isSimpleInitial : "";
          return (
            
              
                {getFieldDecorator(`${id}`, {
                  initialValue
                })(this.getFormItem(formItem, val))
                }
              
            
          );
        });
  };
 
 
    
 extenArr = (extenData = []) => {
    return extenData.map((item) => {
      const { key, value } = item;
      const { fieldKey, fieldLabel } = key;
      let { dataSource } = key;
      let spanValue = "";
      if (dataSource === "") {
        spanValue = value;
      } else {
        try {
          dataSource = dataSource.replace(/"/img, """);
          const jsonValue = JSON.parse(dataSource);
          spanValue = jsonValue.reduce((total, i) => {
            total[i.key] = i.value;
            return total;
          }, {})[value];
        } catch (e) {
          spanValue = "";
        }
      }
      return {
        name: fieldLabel,
        id: fieldKey,
        spanValue
      };
    });
  };




        

          
            {
              Object.entries(linksObj)
                .map((item, index) => {
                  const [item1, item2] = item;
                  return 

                    
{item1}
                    
                      {
                        this.getFormDataDom(item2)
                      }
                    
                         
;
                })
            }
            {
              this.getFormDataDom(this.extenArr(extenData))
            }