一、陣列方法簡單總結為以下幾種

　　1、原有：　　　　　增、刪、改、截、拼、復、排、轉

　　2、ES5擴充套件：　　　查、遍歷

增：

　　　　　　　前增
            var arr = [3,4,5,6,7];
            console.log(arr.unshift(1,2,[true,false]));        //8
            console.log(arr);                                //Array(8) [ 1, 2, (2) […], 3, 4, 5, 6, 7 ]


            後增
            
 
var arr = [3,4,5,6,7];
            console.log(arr.push(1,2,[true,false]));        //8
            console.log(arr);                                //Array(8) [ 3, 4, 5, 6, 7, 1, 2, (2) […] ]

刪：

            前刪
            var arr = [3,4,5,6,7];                            //3 刪除的元素
            console.log(arr.shift());                        //
 
Array(4) [ 4, 5, 6, 7 ]
            console.log(arr);
            後刪
            var arr = [3,4,5,6,7];                            
            console.log(arr);
            console.log(arr.pop());                            //7
            console.log(arr);                                //Array(4) [ 3, 4, 5, 6 ] 
 

改：

            改
            var arr = [3,4,5,6,7];                            //
            console.log(arr);
            console.log(arr.splice(1,2)); //從下標1開始，刪除2個元素    //Array [ 4, 5 ]
            console.log(arr);                                            //Array(3) [ 3, 6, 7 ]
            
            var arr = [3,4,5,6,7];
            console.log(arr);
            console.log(arr.splice(1,2,8,9,[true,false,null])); //Array [ 4, 5 ]        //把4,5改成8,9,[true,false,null]
            console.log(arr);                                    //Array(6) [ 3, 8, 9, (3) […], 6, 7 ]
            
            var arr = [3,4,5,6,7];
            console.log(arr);
            console.log(arr.splice(1,2,8,9,[true,false,null]));    //Array [ 4, 5 ]
            console.log(arr);                                    //Array(6) [ 3, 8, 9, (3) […], 6, 7 ]
            
            var arr = [3,4,5,6,7];
            console.log(arr);
            console.log(arr.splice(1,0,8,9,[true,false,null])); //Array []
            console.log(arr);                                    //Array(8) [ 3, 8, 9, (3) […], 4, 5, 6, 7 ]

截：