在js前端面試過程中，經(jīng)常會(huì)遇到這樣的筆試題：JS中如何比較兩個(gè)Json對(duì)象是否相等實(shí)例代碼，下面小編抽點(diǎn)時(shí)間給大家整理下，一起看看吧。

1.先準(zhǔn)備三個(gè)工具方法，用于判斷是否是對(duì)象類型，是否是數(shù)組，獲取對(duì)象長(zhǎng)度

function isObj(object) {

return object && typeof (object) == 'object' && Object.prototype.toString.call(object).toLowerCase() == "[object object]";

}

function isArray(object) {

return object && typeof (object) == 'object' && object.constructor == Array;

}

function getLength(object) {

var count = 0;

for (var i in object) count++;

return count;

}

2.準(zhǔn)備兩個(gè)相同或不同的Json對(duì)象

var jsonObjA = {

"Name": "MyName",

"Company": "MyCompany",

"Infos": [

{ "Age": "100" },

{

"Box": [

{ "Height": "100" },

{ "Weight": "200" }

]

}

],

"Address": "馬欄山"

}

var jsonObjB = {

"Name": "MyName",

"Company": "MyCompany",

"Infos": [

{ "Age": "100" },

{

"Box": [

{ "Height": "100" },

{ "Weight": "200" }

]

}

],

"Address": "馬欄山二號(hào)"

}

3.主要的代碼

function Compare(objA, objB) {

if (!isObj(objA) || !isObj(objB)) return false; //判斷類型是否正確

if (getLength(objA) != getLength(objB)) return false; //判斷長(zhǎng)度是否一致

return CompareObj(objA, objB, true);//默認(rèn)為true

}

function CompareObj(objA, objB, flag) {

for (var key in objA) {

if (!flag) //跳出整個(gè)循環(huán)

break;

if (!objB.hasOwnProperty(key)) { flag = false; break; }

if (!isArray(objA[key])) { //子級(jí)不是數(shù)組時(shí),比較屬性值

if (objB[key] != objA[key]) { flag = false; break; }

} else {

if (!isArray(objB[key])) { flag = false; break; }

var oA = objA[key], oB = objB[key];

if (oA.length != oB.length) { flag = false; break; }

for (var k in oA) {

if (!flag) //這里跳出循環(huán)是為了不讓遞歸繼續(xù)

break;

flag = CompareObj(oA[k], oB[k], flag);

}

}

}

return flag;

}

4.調(diào)用方法

var result = Compare(jsonObjA, jsonObjB);

console.log(result); // true or false