2如何使用UnderscoreJs比较2个JSON的所有属性（一个除外）？

Rishi 发表于 Dev

里士

我正在使用下划线js的_.isFilter方法。如果我要检查2个JSON是否相同，它会完美地工作。但是我面临一个小问题。在一个JS中，我也有$$ hashKey作为属性，而在另一个JS中则不存在。我如何比较2个JSON的所有属性，除了一个属性，即$$ hashKey。

$rootScope.jsonOfHRA =  $scope.setFileNameAndOtherProperties($rootScope.jsonOfHRA);
globalJsonHRA = JSON.parse(JSON.stringify($rootScope.jsonOfHRA));

//This is how I make a deep copy of JSON

JSONOFHRA=
{
  "toShowVerified": 0,
  "sec10_decl_id": 390,
  "toShowEdit": 0,
  "toShowlineItemEditable": true,
  "edit": false,
  "sec10_decl_act_val": 0,
  "sec10_decl_other_text1": "asdsa",
  "sec10_decl_other_text2": "3434",
  "sec10_decl_other_text3": "adasda",
  "sec10_decl_decl_from_dt": "01/05/2014",
  "sec10_decl_status": 0,
  "sec10_decl_yr_end": "2015-03-31",
  "sec10_decl_yr_id": 2014,
  "listOfAttachments": [],
  "nameOfPayheadToShow": "HRA",
  "sec10_decl_proof": 0,
  "sec10_decl_ver_val": 0,
  "sec10_decl_yr_st": "2014-04-01",
  "sec10_decl_cust_id": 315,
  "add": false,
  "sec10_decl_curr_id": 0,
  "sec10_decl_mod_on": "2014-10-28 12:46:14.0",
  "sec10_decl_add_on": "2014-10-28 12:38:49.0",
  "sec10_decl_decl_to_dt": "30/06/2014",
  "sec10_decl_user_id": 32967,
  "sec10_decl_active": 0,
  "sec10_decl_decl_val": 1234,
  "sec10_decl_head_id": 3,
  "sec10_decl_decl_text": "Delhi",
  "$$hashKey": "19I"
}


GLOBALJSON = 
{
  "toShowVerified": 0,
  "sec10_decl_id": 390,
  "toShowEdit": 0,
  "toShowlineItemEditable": true,
  "edit": false,
  "sec10_decl_act_val": 0,
  "sec10_decl_other_text1": "asdsa",
  "sec10_decl_other_text2": "3434",
  "sec10_decl_other_text3": "adasda",
  "sec10_decl_decl_from_dt": "01/05/2014",
  "sec10_decl_status": 0,
  "sec10_decl_yr_end": "2015-03-31",
  "sec10_decl_yr_id": 2014,
  "listOfAttachments": [],
  "nameOfPayheadToShow": "HRA",
  "sec10_decl_proof": 0,
  "sec10_decl_ver_val": 0,
  "sec10_decl_yr_st": "2014-04-01",
  "sec10_decl_cust_id": 315,
  "add": false,
  "sec10_decl_curr_id": 0,
  "sec10_decl_mod_on": "2014-10-28 12:46:14.0",
  "sec10_decl_add_on": "2014-10-28 12:38:49.0",
  "sec10_decl_decl_to_dt": "30/06/2014",
  "sec10_decl_user_id": 32967,
  "sec10_decl_active": 0,
  "sec10_decl_decl_val": 1234,
  "sec10_decl_head_id": 3,
  "sec10_decl_decl_text": "Delhi"
}

//This is how I am comparing
if(_.isEqual(modifiedJson[i], GlobalUnmodifiedJson[j])){
                                        var idOfUnmodifiedLineItem = modifiedJson[i]["sec10_decl_id"];
                                        alert("Coming here in realm of unmodified of modifed");
                                        modifiedJson = _.filter(modifiedJson, function(item) {
                                            return item.id !== idOfUnmodifiedLineItem;
                                        });

戴文·崔恩（Davin Tryon）

您可以使用_.omit函数在stringify：之前取出不想比较的键：

从underscore.js文档中：

省略 _.omit(object, *keys)
返回该对象的副本，该对象经过过滤以省略列入黑名单的键（或键数组）。或者，接受一个谓词，该谓词表示要忽略的键。

_.omit({name: 'moe', age: 50, userid: 'moe1'}, 'userid');
=> {name: 'moe', age: 50}

_.omit({name: 'moe', age: 50, userid: 'moe1'}, function(value, key, object) {
    return _.isNumber(value);
});
=> {name: 'moe', userid: 'moe1'}

在你的情况，你可以创建从JSON，对象omit的$$hashKey属性，然后进行比较。

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