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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
array.unshift( element1, ..., elementN );
下面是參數的詳細資料：
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：
<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：
Returned array is : water,orange,mango,banana,sugarLength of the array is : 5
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