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                ~~~ <script> var arr = [1,2,3,4,5,6]; // console.log(arr[0]); /* 查詢數組中值的下標 arr.indexOf(value) indexOf查詢第一個下標 后面的查詢不到 */ // var index = arr.indexOf(5); // console.log(index); /* slice--截取 slice傳連個參數第一個是起始下標,下標從零開始。第二個是起始下標加上要截取出來的長度 */ var b = arr.slice(1,3); console.log(b); console.log(arr); </script> ~~~
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