详解JavaScript对数组操作（添加/删除/截取/排序/倒序）

var arr = new Array();

var arr = [];

arrayJson.dataList.splice(0,arr.length);

/** * 假设数组的长度值为偶数，如何将指定元素添加到数组中间位置。 */function array_middle_insert() {	var arr = ['1','2','3','4','5','6'];	if(0 == arr.length % 2) {	//偶数		arr.splice(arr.length / 2,0,'中间添加');	}	//["1","2","3","中间添加","4","5","6","7"]	console.log(JSON.stringify(arr));}

/** * concat:连接两个或者多个数组，并且返回该数组 * 语法：array.concat(object,object,......); */function array_concat() {	var arr = [{index:'0'},{address:'1'}];	var arr_1 = [{index:'3'},{index:'4'}];		var newArr = arr.concat(arr_1);	//[{"index":"0"},{"address":"1"},{"index":"3"},{"index":"4"}]	console.log(JSON.stringify(newArr));}

/** * join():通过指定字符对数据进行分割，返回字符串。 * jon(分隔符); */function array_join() {	var arr = ['1','2','3'];	var str = arr.join('-');	//1-2-3	console.log(str);}

/** * pop():删除数组的最后一个对象，返回该删除元素的值 */function array_pop() {	var arr = [{index:'0'},{address:'1'}];	var pop_data = arr.pop();		//{"address":"1"}	console.log(JSON.stringify(pop_data));	//[{"index":"0"}]	console.log(JSON.stringify(arr));}

/** * push：向数组末尾添加一个或者多个对象。 * array.push(newObject1,newObject2,.....); */function array_push() {	//实例化一个数组对象	var arr = new Array();	var obj_1 = { index:'1', index:'2'};	var obj_2 = { index:'3', index:'3'};		arr.push(obj_1,obj_2);	//[{"index":"2"},{"index":"3"}]	console.log(JSON.stringify(arr));}

/** * shift():该方法用户删除数组的第一个对象，并返回删除的元素 */function array_shift() {	var arr = [{index:'0'},{address:'1'}];	var shift_data = arr.shift();	//{"index":"0"}	console.log(JSON.stringify(shift_data));	//[{"address":"1"}]	console.log(JSON.stringify(arr));}

/** * slice()：从已知数组中返回指定选中的数据,该操作不会修改原数组的数据 * slice(start,end); */function array_slice() {	var arr = ['1','2','3','4','5'];	var new_array = arr.slice(1,arr.length);	//["2","3","4","5"]	console.log(JSON.stringify(new_array));	//["1","2","3","4","5"]	console.log(JSON.stringify(arr));}

/** * sort():方法用户对数组的排序 * sort(sortby)		sortby可选，必须是函数。如调用方法没有使用参数，则按字母顺序进行排序。 */function array_sory() {	var arr = [{index:'500'},{index:'40'},{index:'100'},{index:'50'}];	var new_array = arr.sort(function(a,b) {		var n1 = Number(a.index);		var n2 = Number(b.index);		return n1 - n2;	});	//[{"index":"40"},{"index":"50"},{"index":"100"},{"index":"500"}]	console.log(JSON.stringify(new_array));}

/** * 向数组中删除/添加对象，并返回被删除的元素。 * splice(index,count,item1,item2,......);	 * index:规定删除/添加项目的起始位置，使用负数从数组的结尾处规定位置。 * count:规定要删除项目的数量 * item1,item2...:向项目中添加添加新的对象 */function array_splice() {	var arr = ['1','2','3'];	var new_array = arr.splice(0,2,'4','5');	//["1","2"]	console.log(JSON.stringify(new_array));	//["4","5","3"]	console.log(JSON.stringify(arr));}

/** * 向数组开头添加一个或者多个元素，并返回新的长度。 */function array_unshift() {	var arr = [{index:'0'},{address:'1'}];	var obj_1 = {index:'2'};	var obj_2 = {index:'3'};	var length = arr.unshift(obj_1,obj_2);	//4	console.log(length);	//[{"index":"2"},{"index":"3"},{"index":"0"},{"address":"1"}]	console.log(JSON.stringify(arr));}

[	{		"dateMonth":"05",		"hopeMoney":"12000",		"data":[			{				"brickId":"1",				"brickYear":"2017-05-15",				"brickWeek":"星期二",				"brckInfo":[					{						"bringMoneyOrExpenditure":"5000",						"brickClass":"工资",						"brickIcon":"ion-ios-star-outline"					},					{						"bringMoneyOrExpenditure":"-2000",						"brickClass":"其他",						"brickIcon":"ion-ios-star-outline"					}				]			},			{				"brickId":"1",				"brickYear":"2017-05-02",				"brickWeek":"星期六",				"brckInfo":[					{						"bringMoneyOrExpenditure":"10000",						"brickClass":"工资",						"brickIcon":"ion-ios-star-outline"					}				]			}		]	},	{		"dateMonth":"04",		"hopeMoney":"12000",		"data":[			{				"brickId":"1",				"brickYear":"2017-04-15",				"brickWeek":"星期一",				"brckInfo":[					{						"bringMoneyOrExpenditure":"5000",						"brickClass":"工资",						"brickIcon":"ion-ios-star-outline"					}				]			}		]	}]