详解JavaScript对数组操作（添加/删除/截取/排序/倒序）

js对数组对象的操作以及方法的使用

如何声明创建一个数组对象：

var arr = new Array();

或者

var arr = [];

如何移除所有数组中数据？

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

如何指定位置对数组对象的添加，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));
}

数组对象方法的是使用介绍：

cancat()

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()

function array_join() {
	var arr = ['1','2','3'];
	var str = arr.join('-');
	//1-2-3
	console.log(str);
}

pop()

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()

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()

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()

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()

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));
}

splice()

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));
}

unshift()

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));
}

toString()：将数组转换成字符串，并返回该结果。不会改变原数组的数据。
toLocaleString()：将数组装换成本地字符，并返回结果，用“，”分割。类似toString 方法。
reverse()：该该方法颠倒数组的顺序

一下举栗声明json数组串较为复杂并且灵活的格式。

[
	{
		"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"
					}
				]
			}
		]
	}
]

以上所述是小编给大家介绍的Javascript对数组操作详解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对考高分网网站的支持！