[JavaScript知识库]js 两个简单数组或者json数组比较，获取相同项

1、两个简单数组对比

// 获取两个数组的相同项(简单数据格式)
export const getArrEqual = (arr1, arr2) => {
  let newArr = [];
  for (let i = 0; i < arr2.length; i++) {
    for (let j = 0; j < arr1.length; j++) {
      if (arr1[j] === arr2[i]) {
        newArr.push(arr1[j]);
      }
    }
  }
  return newArr;
};

2、两个json数组对比

// 获取两个JSON数组的相同项
export const getJsonArrEqual = (arr1, arr2) => {
  var newArr = [], kvIndex = {};
  for (var i = 0; i < arr1.length; i++) {
    for (var j = 0; j < arr2.length; j++) {
      if (arr1[i].title == arr2[j].title) {
        var item
        if (kvIndex[arr1[i].title] == undefined) {
          kvIndex[arr1[i].title] = newArr.length;
          item = {};
          for (var attr in arr1[i]) item[attr] = arr1[i][attr];
          newArr[kvIndex[arr1[i].title]] = item;
        } else {
          item = newArr[kvIndex[arr1[i].title]];
          for (var attr in arr2[j]) item[attr] = arr2[j][attr];
        }
      }
    }
  }
  return newArr
}

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