자바스크립트 배열 연산(삭제, 추가, 가로채기, 병합 등 포함) 사용 예 요약

var a = [1,2,3,4,5]; a.pop();//a：[1, 2, 3, 4] a.pop();//a：[1, 2, 3] a.pop();//a：[1, 2]

var a = [1,2,3,4,5]; a.shift(); //a：[2,3,4,5] a.shift(); //a：[3, 4, 5]

var a = [1,2,3,4,5]; a.push(6);//[1, 2, 3, 4, 5, 6] aa.push('xx');//[1, 2, 3, 4, 5, 6, "xx"] 返回长度7 a.push('yy');//[1, 2, 3, 4, 5, 6, "xx", "yy"] 返回长度8

var a = [1,2,3,4,5]; a.unshift();//[1, 2, 3, 4, 5] a.unshift("cc");//["cc", 1, 2, 3, 4, 5] 返回长度6 a.unshift("aaa");//["aaa", "cc", 1, 2, 3, 4, 5] 返回长度7

var a = [1,2,3,4,5]; a.reverse()//a：[5, 4, 3, 2, 1] 返回[5, 4, 3, 2, 1]

var a = [1,2,3,4,5]; var b=a.join('||');//b:"1||2||3||4||5" a:[1,2,3,4,5]

var a = ['a','b','c','d','e']; a.indexOf('a');//0 a.indexOf(a);//-1 a.indexOf('f');//-1 a.indexOf('e');//4

var a = ['a','b','c','d','e']; a.slice(1,3);//["b", "c"] a:['a','b','c','d','e'] a.slice(0,4);//["a", "b", "c", "d"] a.slice(3,4);//["d"]