在js前端面試過程中，經常會遇到這樣的筆試題：JS中如何比較兩個Json對象是否相等實例代碼，下面小編抽點時間給大家整理下，一起看看吧。
1.先準備三個工具方法，用于判斷是否是對象類型，是否是數組，獲取對象長度
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.準備兩個相同或不同的Json對象
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"}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; //判斷長度是否一致return CompareObj(objA, objB, true);//默認為true}function CompareObj(objA, objB, flag) {for (var key in objA) {if (!flag) //跳出整個循環break;if (!objB.hasOwnProperty(key)) { flag = false; break; }if (!isArray(objA[key])) { //子級不是數組時,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) //這里跳出循環是為了不讓遞歸繼續break;flag = CompareObj(oA[k], oB[k], flag);}}}return flag;}4.調用方法
var result = Compare(jsonObjA, jsonObjB);console.log(result); // true or false
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