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      • JavaScript教程之Array,prototype.concat.apply與[].conat.ap

      • 2019-04-27 15:28 來源:未知

       

       一直都知道JS數組Array內置對象有一個concat方法,但是也沒怎么研究過,今天偶然就看了看

        concat是連接一個或多個數組

       返回的是連接后數組的一個副本

      var oldArr=[];

      var arr=[[1,2,3],[4,5,6],[7,8,9],[10,11,12]];

      var newArr=oldArr.conat(arr);

      console.log(newArr);

       

       

       

      console.log(oldArr);//[]  沒有改變

       

      于是乎 我又想到把數組的每一項都當成數組與oldArr連接

      這就需要apply方法了 將數組變成參數列表傳參

      console.log(Array.prototype.concat.apply(Array,arr));

      //結果很奇怪

      沒有得到想到的結果

       

       

       箭頭地方是什么鬼???

       想了想

       Array.prototype.concat.apply(Array,arr);

       不就是Array調用了Array.prototype上的concat然后傳入參數arr

      把Array 換成Number String 等 不就是 借用Array.prototype上的concat方法罷了

      然后把調用者添加到數組的0位置

      我感覺就是 arr.unshift(Array);

      其他情況的話就會 push 了

      看下面的圖就明白了吧

      console.log(Array.prototype.concat.apply(Number,arr));

       

      console.log(Array.prototype.concat.apply(String,arr));

       

      console.log(Array.prototype.concat.apply(RegExp,arr));

       

       好像是這么回事

      所以 把aplly里面的參數改成[]不就好了

      console.log(Array.prototype.concat.apply([],arr));

      可以簡單點寫[].concat.apply([],arr);

       

        數組不僅可以連接數組  數組還可以連接字符串  數字  對象  等

         console.log([].concat({a:2,b:3,c:3}));

       

       他會把對象放在數組里,這里就不能說連接了吧 我中有你嘛

      console.log([].concat("123"}));

       

      根據這些我總結出了  如果 concat傳入的參數不是數組 就不會遍歷 直接暴力添加到數組項

      而參數是數組的話就會遍歷

       

      需要注意的是  千萬不要傻傻的 用String.concat(); Number.concat()等

      上面的是用apply方法改變this指向借用的

      它本身沒有concat

      String.prototype里面有concat但是實現結果不一樣滴!

      只是我個人的理解 希望對大家有幫助

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