js學習中常遇到的陣列方法，總結很到位

js數組方法的總結：1、隊尾插入push，2、隊尾刪除並返回刪除的最後一項pop，3、隊首插入unshift()，4、隊首刪除shift()，5、陣列一加入陣列二concat()

1、隊尾插入push

   var colors = ["red","green"];
   colors.push("black"):
   console.log(colors); //["red","green","black"]

2、隊尾刪除並回傳刪除的最後一項pop

   var colors = ["red","green","black"];
   var item = colors.pop();
   console.log(item); //"black"

3、隊首插入unshift()

   var colors = ["red","green"];
   colors.unshift("black");
   var item = colors.pop();
   console.log(item); //"black"

4、隊首刪除shift()

   var colors = ["red","green","black"];
   colors.shift();
   console.log(colors); //["green","black"]

5、陣列一新增陣列二concat()

   var colors = ["red","green","black"];
   var colors2 = colors.concat("yellow",["blue","brown"]);
   console.log(colors); //["red","green","black"]
   console.log(colors2); //["red","green","black","yellow","blue","brown"]

6、陣列的截取slice ()
  只傳一個參數：從陣列這個參數的下標開始截取一直到陣列結束。

   var colors = ["red","green","black"];
   colors.slice(1); //["green","black"]
   console.log(colors); //["red","green","black"]

傳送兩個參數：第一個是截取開始的位置，第二個是截取結束的位置

   var colors = ["red","green","black","yellow","blue","brown"];
   colors.slice(1,3)//从位置1开始，到位置2结束["green","black"];

7、陣列的splice()方法

   有三种用法：

• 刪除：可以刪除任意數量的項，只需指定兩個參數：第一個參數為刪除開始的位置，第二個參數為刪除項數。

• 插入：可以向指定位置插入任意數量的項，只需提供3個參數：起始位置、0（要刪除的項數）和要插入的項。例如：splice（2,0,"red","green")，會從目前陣列的位置2開始插入字串"red"和"green"。

• 替換: 可以向指定位置插入任意數量的項，且同事刪除任意數量的項，只需提供3個參數：起始位置、要刪除的項數和要插入的任意數量的項。插入的項數不必與刪除項數相等。例如：splice (2,1,"red","green") 會刪除目前陣列位置2的項，然後再從位置2開始插入字串。

   var colors = ["red","green","black"];
   var removed = colors.splice(0,1);
   console.log(colors); //["green","black"]
   console.log(removed); //["red"]
    
   removed = colors.splice(1,0,"yellow","orange");
   console.log(colors); //["green","yellow","orange","black"]
   console.log(removed); //[]

   removed = colors.splice(1,1,"red","purple");
   console.log(colors); //["green","red","purple","orange","black"]
   console.log(removed); //["yellow"]

8、位置方法indexOf()和lastIndexOf()

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