JSON数组 *** 作函数：去重、按key值分割显示

JSON数组去重

/*
 * JSON数组去重
 * @param: [array] json Array
 * @param: [string] 唯一的key名，根据此键名进行去重
 */
const uniqueArray = (array, key) => {
  if (array.length > 0) {
    var result = [array[0]];
    for (var i = 1; i < array.length; i++) {
      var item = array[i];
      var repeat = false;
      for (var j = 0; j < result.length; j++) {
        if (item[key] == result[j][key]) {
          repeat = true;
          break;
        }
      }
      if (!repeat) {
        result.push(item);
      }
    }
    return result;
  } else {
    return array;
  }
}

调用

let arr = [{userName: '张三',userID: 3},{userName: '张三',userID: 3},{userName: '李四',userID: 4}];
console.log(uniqueArray(arr, 'userID')); 

按key值分割显示

const formatterList2Str = (arr, ckey, split = ',') => {
  if (arr && arr.length > 0) {
    return arr.map(v => v[ckey]).join(split);
  }
  return "";
}

let arr = [{userName: '张三',userID: 3},{userName: '李四',userID: 4}];
console.log(formatterList2Str(arr, 'userName')); // 张三,李四