function fun1(obj){ var names={}; /*for in 可以用于数组或者对象*/ for(var name in obj){ names[name] = obj[name].toLowerCase() } console.log(names); }; var obj1 = {username: 'NAME', password: 'WOSHIDHS123'}; fun1(obj1);…

Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[0]      An unhandled exception has occurred while executing the requestSystem.InvalidOperationException: 可为空的对象必须具有一个值.   在 System.ThrowHelper.ThrowInvalidOperationException(ExceptionR…

//构建一个json对象 var pinpai = { "0":{"美的":49,"三星":35,"海信":25,"格力":16,"方太":14}, "1":{"美的":49,"三星":35,"海信":25,"格力":16,"方太":14} }: jiage = pin…

比如我现在有个data数据如下: data: { playIndex: null, courseList: [{ videoId: '0', isPlaying: false, }, { videoId: '1', isPlaying: false, }] }, 我现在想要修改courseList里面的isPlaying的值该怎么做呢? var thisIdx = e.currentTarget.dataset.index; var playStatus = "courseList["…

1.json中输出各个键值: var ohp = {"星期一":18,"星期二":16,"星期三":19,"星期四":11,"星期五":99,"星期六":0,"星期日":0}; for(var key in ohp){ console.log(key); console.log(ohp[key]); } 2.查询星期五的值:  console.log(ohp[&quo…

1.JSON(JavaScript Object Notation)一种简单的数据格式,比xml更轻巧.JSON是JavaScript原生格式,这意味着在JavaScript中处理JSON数据不需要任何特殊的API或工具包. JSON的规则很简单:对象是一个无序的"'名称:值'对"集合.一个对象以"{"(左括号)开始,"}"(右括号)结束.每个"名称"后跟一个":"(冒号):"'名称/值'对&qu…

给数组去除重复值 Array.prototype.distinct = function() { var arr = this, result = [], i, j, len = arr.length; for (i = 0; i < len; i++) { for (j = i + 1; j < len; j++) { if (arr[i] === arr[j]) { j = ++i; } } result.push(arr[i]); } return result;} 2.给json数组对…

//方法一:修改JSONObject的键 public static JSONObject changeJsonObj(JSONObject jsonObj,Map<String, String> keyMap) { JSONObject resJson = new JSONObject(); Set<String> keySet = jsonObj.keySet(); for (String key : keySet) { String resKey = keyMap.get(k…

var he={'aa':"aa",'bb':'bb'}; var chun={'cc':"aa",'dd':'mm'}; c=he.aa; n=chun.c;//此方式错误,将c作为对象的属性名了,可对象中没此对象名,正确方式chun[c] alert(n);…

using Newtonsoft.Json; JsonSerializer serialiser = new JsonSerializer(); string newContent = string.Empty; using (StreamReader reader = new StreamReader(file.FullName)) { string json = reader.ReadToEnd(); dynamic jsonObj = JsonConvert.DeserializeObje…