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                [TOC] ### 1.數組求和 ~~~ <script> var arr = [1,2,3,4]; /* var sum = arr.reduce(function(a,b){ return a+b; }) */ var sum = arr.reduce((a,b)=>a+b); console.log(sum); </script> ~~~ ### 2.reverse 顛倒順序 ~~~ <script> let arr = [1,2,3,4]; arr.reverse(); console.log(arr); </script> ~~~ ### 3.類型確定 #### 3.1isArray(只適用于數組類型) #### 3.2instanceof,就是判斷一個實例是否屬于某種類型(適用于任何想去確定的數據類型) ~~~ <script> var arr = [1,2,3,4]; console.log(Array.isArray(arr));//true console.log(arr instanceof Array);//true </script> ~~~ ### 4.constructor > 實例對象constructor屬性,指向構造函數 ~~~ <script> function Person(name,age){ this.name = name; this.age = age; } var pi = new Person("pi",20); console.log(pi); //instanceof 就是判斷一個實例是否屬于某種類型 console.log(pi instanceof Person);//true console.log(pi.constructor == Person);//true </script> ~~~ ### 5.二維數組 ~~~ <script> var arr = [1,2,3,[4,5,6]]; console.log(arr[3][1]); </script> ~~~ ### 6.獲取數組中的最大(最小)值 > Math.min.apply(obj,arr);//這個obj對象將代替Function類里this對象,第二個傳進來的是數組 ~~~ <script> var arr = [1,2,3,4,5,6]; var max = Math.max.apply(null,arr); var min = Math.min.apply(null,arr); console.log(min);//1 console.log(max);//6 console.log(arr.constructor == Array);//true </script> ~~~
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