1、shift:删除原數組的第一項，傳回删除元素的值；如果數組為空則傳回undefined
1 //shift:删除原數組的第一項，傳回删除元素的值；如果數組為空則傳回undefined
2 var arr = [1, 2, 3, 4, 5];
3 var out = arr.shift();
4 console.log(arr); //[2,3,4,5]
5 console.log(out); //1
6 var arr = [];
7 var out = arr.shift();
8 console.log(arr); //[]
9 console.log(out); //undefined
2、unshift:将參數添加到原數組開頭，傳回數組的長度(ie6下傳回undefined)
1 //unshift:将參數添加到原數組開頭，傳回數組的長度(ie6下傳回undefined)
2 var arr = [1, 2];
3 var out = arr.unshift(-1, 0);
4 console.log(arr); //[-1,0,1,2]
5 console.log(out); //4
3、pop:删除原數組的最後一項，傳回數組删除的值；如果數組為空則傳回undefined
1 //pop:删除原數組的最後一項，傳回數組删除的值；如果數組為空則傳回undefined
2 var arr = [1, 2, 3, 4, 5];
3 var out = arr.pop();
4 console.log(arr); //[1,2,3,4]
5 console.log(out); //5
6 var arr = [];
7 var out = arr.pop();
8 console.log(arr); //[]
9 console.log(out); //undefined
4、push:将參數添加到原數組的末尾，傳回數組的長度
1 //push:将參數添加到原數組的末尾，傳回數組的長度
2 var arr = [1, 2, 3];
3 var out = arr.push(4, 5, 6);
4 console.log(arr); //[1,2,3,4,5,6]
5 console.log(out); //6
5、concat:傳回一個将參數添加到原數組中構成的新數組
1 //concat:傳回一個将參數添加到原數組中構成的新數組
2 var arr = [1, 2, 3];
3 var out = arr.concat(4, 5);
4 console.log(arr); //[1,2,3]
5 console.log(out); //[1,2,3,4,5]
6、splice(start,deleteCount,val1,val2,...):從start位置開始删除原數組deleteCount項，并從該位置起插入val1,val2,...，傳回删除的項組成的新數組
1 //splice(start,deleteCount,val1,val2,...):從start位置開始删除原數組deleteCount項，并從該位置起插入val1,val2,...，傳回删除的項組成的新數組
2 var arr = [1, 2, 3, 4, 5];
3 var out = arr.splice(2, 2, 7, 8, 9, 10);
4 console.log(arr); //[1,2,7,8,9,10,5]
5 console.log(out); //[3,4]
6 //在清空數組時僅需傳遞start，如果不删除所有元素，再傳遞deleteCount
7 var arr = [1, 2, 3, 4, 5];
8 var out = arr.splice(2);
9 console.log(arr); //[1,2]
10 console.log(out); //[3,4,5]
11 //同shift
12 var arr = [1, 2, 3, 4, 5];
13 var out = arr.splice(0, 1);
14 console.log(arr); //[2,3,4,5]
15 console.log(out); //[1]
16 //同unshift
17 var arr = [1, 2, 3, 4, 5];
18 var out = arr.splice(0, 0, 22, -1, 0);
19 console.log(arr); //[22,-1,0,1,2,3,4,5]
20 console.log(out); //[]
21 //同pop
22 var arr = [1, 2, 3, 4, 5];
23 var out = arr.splice(arr.length - 1, 1);
24 console.log(arr); //[1,2,3,4]
25 console.log(out); //[5]
26 //同push
27 var arr = [1, 2, 3, 4, 5];
28 var out = arr.splice(arr.length, 0, 6, 7, 8);
29 console.log(arr); //[1,2,3,4,5,6,7,8]
30 console.log(out); //[]
7、reverse:将原數組倒序
1 //reverse:将原數組倒序
2 var arr = ['a', 1, {}, [2, 3]];
3 console.log(arr); //['a', 1, {}, [2, 3]]
4 var out = arr.reverse();
5 console.log(arr); //[[2,3],{},1,'a']
6 console.log(out); //[[2,3],{},1,'a']
7 var arr = [0, 1, 5, 10, 15];
8 arr.reverse();
9 console.log(arr); //[15,10,5,1,0]
10 var arr = [1, 0, 5, 15, 10];
11 arr.reverse();
12 console.log(arr); //[10,15,5,0,1]
8、sort(orderfunction):sort()為升序排列
1 //sort(orderfunction):sort()為升序排列，但是先調用每個數組項的toString()方法，然後比較字元串來排序，是按ASCII進行比較的；
2 //是以跟reverse不同原理不同。sort()不帶參數的時候是從字面上對數組排序
3 var arr = [0, 1, 5, 10, 15];
4 arr.sort();
5 console.log(arr); //0,1,10,15,5 ,注意這裡是字元串按ASCII進行比較的
6 //調用這樣的函數就按數值方式排列了
7 function sortNumber(a, b) {
8 return a - b
9 }
10 arr.sort(sortNumber);
11 console.log(arr); //0,1,5,10,15
9、slice(start,end):傳回從原數組中指定start到end(不包含該元素)之間的項組成的新數組
1 //slice(start,end):傳回從原數組中指定start到end(不包含該元素)之間的項組成的新數組,如隻有一個參數，則從start到數組末尾
2 var arr = [1, 2, 3, 4, 5, 6, 7, 8];
3 var out = arr.slice(2,3);
4 console.log(arr); //[1, 2, 3, 4, 5, 6, 7, 8]
5 console.log(out); //[3]
10、join(separator):将數組的元素組成一個字元串
1 //join(separator):将數組的元素組成一個字元串，以separator為分隔符，省略的話則用預設用逗号為分隔符
2 var arr = [1, 2, 3, 4, 5, 6];
3 var out = arr.join();
4 console.log(arr); //[1, 2, 3, 4, 5, 6]
5 console.log(out); //1,2,3,4,5,6
6 out = arr.join("");
7 console.log(out); //123456
8 out = arr.join("&");
9 console.log(out); //1&2&3&4&5&6
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