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                [TOC] ## **如何判斷一個對象是否為數組** ``` var a = [1,2,3,4,5]; console.log(a.constructor==Array);//ture console.log(a instanceof Array);//ture ``` ## **數組的方法** 增刪改查 ### **增:** 1. push:從數組后增加 2. unshift:從最前面開始增加(可將數組作為一個元素傳入) 3. concat:**不改變數組的結構** ~~~ var new = old.concat(1,2); ~~~ 4. splice:傳參(index,howmany,content) ——————起始下標(包含),更改個數,更改的內容 ~~~ var arr = [1,2,3,4,5]; arr.splice(2,3,7,10);//1,2,7,10 ~~~ * * * ### **刪:** 1. pop:從后刪,默認刪一個 2. shift:從頭刪,默認刪一個 3. splice:(index,howmany) * * * ### **改:** 1. arr\[index\] = content; 2. splice:(index,howmany,content) 3. slice:(startIndex,endIndex)**不改變數組結構**,返回**截取**內容 ~~~ var arr = [1,2,3,4,5,6]; var f = arr.splice(1,3);//[2,3,4]截取3個 var b = arr.slice(1,3);// [2, 3] ~~~ * * * ### **查:** 1. indexOf:查值的下標 2. arr\[index\]:查下標的值 3. charAt(index):查下標的值
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