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                在數組的開頭插入新元素。 ## 語法 ~~~ arrayObj.unshift([item1[, item2 [, . . . [, itemN]]]]) ~~~ ## 參數 |參數|定義| |arrayObj|必需。一個 Array 對象。| |item1, item2,. . ., itemN|可選。用于插到 Array 開頭的元素。| ## 備注 unshift 方法將這些元素插入到一個數組的開頭,以便它們按其在參數表中的次序排列。 下面的示例闡釋了 unshift 方法的用法。 ~~~ var ar = new Array(); ar.unshift(10, 11); ar.unshift(12, 13, 14); document.write(ar.toString()); // Output: 12,13,14,10,11 ~~~
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