JavaScript中join()、splice()、slice()和split()函數用法示例

2024-05-06 16:45:50

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本文實例講述了JavaScript中join()、splice()、slice()和split()函數用法。分享給大家供大家參考，具體如下：

join()

join() 方法用于把數組中的所有元素放入一個字符串。

元素是通過指定的分隔符進行分隔的。

<script type="text/javascript">var arr = new Array(3)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"document.write(arr.join())</script>

運行結果：

George,John,Thomas

<script type="text/javascript">var arr = new Array(3)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"document.write(arr.join("."))</script>

運行結果：

George.John.Thomas

split()

split() 方法用于把一個字符串分割成字符串數組。

<script type="text/javascript">var str="How are you doing today?"document.write(str.split(" ") + "<br />")document.write(str.split("") + "<br />")document.write(str.split(" ",3))</script>

運行結果：

How,are,you,doing,today?
H,o,w, ,a,r,e, ,y,o,u, ,d,o,i,n,g, ,t,o,d,a,y,?
How,are,you

"2:3:4:5".split(":") //將返回["2", "3", "4", "5"]"|a|b|c".split("|") //將返回["", "a", "b", "c"]"hello".split("") //可返回 ["h", "e", "l", "l", "o"]"hello".split("", 3) //可返回 ["h", "e", "l"]

slice()

slice() 方法可從已有的數組中返回選定的元素。

<script type="text/javascript">var arr = new Array(3)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"document.write(arr + "<br />")document.write(arr.slice(1) + "<br />")document.write(arr)</script>

運行結果：

George,John,Thomas
John,Thomas
George,John,Thomas

<script type="text/javascript">var arr = new Array(6)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"arr[3] = "James"arr[4] = "Adrew"arr[5] = "Martin"document.write(arr + "<br />")document.write(arr.slice(2,4) + "<br />")document.write(arr)</script>

運行結果：

George,John,Thomas,James,Adrew,Martin
Thomas,James
George,John,Thomas,James,Adrew,Martin

splice()

splice() 方法向/從數組中添加/刪除項目，然后返回被刪除的項目。

注釋：該方法會改變原始數組。

<script type="text/javascript">var arr = new Array(6)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"arr[3] = "James"arr[4] = "Adrew"arr[5] = "Martin"document.write(arr + "<br />")arr.splice(2,0,"William")document.write(arr + "<br />")</script>

運行結果：

George,John,Thomas,James,Adrew,Martin
George,John,William,Thomas,James,Adrew,Martin

<script type="text/javascript">var arr = new Array(6)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"arr[3] = "James"arr[4] = "Adrew"arr[5] = "Martin"document.write(arr + "<br />")arr.splice(2,1,"William")document.write(arr)</script>

運行結果：

George,John,Thomas,James,Adrew,Martin
George,John,William,James,Adrew,Martin

<script type="text/javascript">var arr = new Array(6)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"arr[3] = "James"arr[4] = "Adrew"arr[5] = "Martin"document.write(arr + "<br />")arr.splice(2,3,"William")document.write(arr)</script>

運行結果：