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                [TOC] >[success] # 字符串concat()方法 ~~~ concat() 方法用于'連接'兩個或多個數組。 該方法不會改變現有的數組,而僅僅會返回被連接數組的一個副本,類似于生成一個新的數組。 ~~~ <br/> >[success] ## 使用方法 ~~~ 例子1 var a = [1, 2, 3]; a.concat(4, 5) // [1, 2, 3, 4, 5] ~~~ ~~~ 例子2 var a = [1, 2, 3]; var b = [4, 5, 6] a.concat(b) // [1, 2, 3, 4, 5, 6] ~~~ ~~~ 例子3 var a = [1, 2, 3] var b = [4, 5, 6] var c = [7, 8, 9] a.concat(b, c) // [1, 2, 3, 4, 5, 6, 7, 8, 9] ~~~ <br/> >[success] ## 應用場景 一般業務邏輯如果有需要2個數組拼接起來時候可以用到它,例如: ~~~ var a = [1, 2, 3] var b = [4, 5, 6] for(var i=0; i<a.concat(b).length; i++){ // 要執行的代碼 } 或者 a.concat(b).forEach(i => { console.log(i) }) ~~~
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