1、.length----获取数组长度;
var arr = [1,2,3,4,5];
console.log(arr.length) //5
2、shift()----删除原数组第一项,并返回删除元素的值;如果数组为空则返回undefined,直接在元数组上修改;
var arr= [1,2,3,4,5];
var result = arr.shift();
console.log(arr) //[2,3,4,5]
console.log(result) //1
3、unshift()----将参数添加到原数组开头,并返回数组的长度,直接在元数组上修改;
arr = [1,2,3,4,5];
result = arr.unshift(-2,-1);
console.log(arr) //[-2,-1,1,2,3,4,5]
console.log(result) //7
4、pop()----删除原数组最后一项,并返回删除元素的值;如果数组为空则返回undefined,直接在元数组上修改;
arr= [1,2,3,4,5];
result = arr.pop();
console.log(arr) //[1,2,3,4]
console.log(result) //5
5、push()----将参数添加到原数组末尾,并返回数组的长度,直接在元数组上修改;
arr = [1,2,3,4,5];
result = arr.push(6,7);
console.log(arr) //[1,2,3,4,5,6,7]
console.log(result) //7
6、concat()----数组合并,返回一个新数组,不影响原数组;
arr = [1,2,3,4,5];
result = arr.concat(6,7);
console.log(arr); //[1,2,3,4,5]
console.log(result); //[1,2,3,4,5,6,7]
7、sort()----将数组从小到大排序,直接在原数组上修改;
arr = [4,5,2,3,1];
result = arr.sort();
console.log(arr); //[1, 2, 3, 4, 5]
console.log(result) //[1, 2, 3, 4, 5]
8、reverse()----将数组反序,直接在原数组上修改;
arr = [4,5,2,3,1];
result = arr.reverse()
console.log(arr); //[1, 3, 2, 5, 4]
console.log(result) //[1, 3, 2, 5, 4]
9、slice(startIndex,endIndex)----截取起始索引startIndex 到 结束索引endIndex之间的项组成新的数组,该新数组包括起始索引startIndex所对应的项,不包括结束索引endIndex所对应的项;
arr = [1,2,3,4,5];
result1 = arr.slice(2,5);
result2 = arr.slice(2);
console.log(arr) //[1,2,3,4,5]
console.log(result1) //[3,4,5]
console.log(result2) //[3,4,5]
10、join(separator)----将数组的元素组起一个字符串,以separator为分隔符,省略的话则用默认用逗号为分隔符,不影响原数组;
arr= [1,2,3,4,5];
result = arr.join("|");
console.log(arr) //[1, 2, 3, 4, 5]
console.log(result) //1|2|3|4|5
11、splice(start,deleteCount,val1,val2,...)----从start位置开始删除deleteCount项,并从该位置起插入val1,val2,... ,直接在原数组上修改;
arr= [1,2,3,4,5];
result1 = arr.splice(2,2,7,8,9);
console.log(arr); //[1,2,7,8,9,5]
console.log(result1); //[3,4]
result2 = arr.splice(0,1); //同shift
console.log(arr); //[2,7,8,9,5]
console.log(result2); //[1]
arr.splice(0,0,-2,-1); //同unshift
console.log(arr); //[-2,-1,2,7,8,9,5]
result3 = arr.length;
console.log(result3); //7
result4 = arr.splice(arr.length-1,1); //同pop
console.log(arr); //[-2,-1,2,7,8,9]
console.log(result4); //[5]
arr.splice(arr.length,0,6,7); //同push
console.log(arr); //[-2,-1,2,7,8,9,6,7]
result5 = arr.length;
console.log(result5) //8
原文地址:http://blog.51cto.com/10325748/2107572