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這篇文章主要介紹了簡介JavaScript中的unshift()方法的使用,是JS入門學習中的基礎知識,需要的朋友可以參考下
JavaScript數組的 unshift()方法將一種或多種元素添加到數組的開頭，並返回該數組的新長度。
文法
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| 1 | array.unshift( element1, ..., elementN ); |
下面是參數的詳細資料：
element1, ..., elementN : 元素添加到數組的前面。
傳回值:
返回新數組的長度。這將返回undefined(未定義)在IE瀏覽器。
例子：
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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | <html> <head> <title>JavaScript Array unshift Method</title> </head> <body> <script type="text/javascript"> var arr = new Array("orange", "mango", "banana", "sugar"); var length = arr.unshift("water"); document.write("Returned array is : " + arr ); document.write("<br /> Length of the array is : " + length ); </script> </body> </html> |
這將產生以下結果：
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| 1 2 | Returned array is : water,orange,mango,banana,sugar Length of the array is : 5 |
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