JavaScript中join()、splice()、slice()和split()函数用法示
本文实例讲述了JavaScript中join()、splice()、slice()和split()函数用法。分享给大家供大家参考，具体如下：
join()
join() 方法用于把数组中的所有元素放入一个字符串。
元素是通过指定的分隔符进行分隔的。
<script type="text/javascript"> var arr = new Array(3) arr[0] = "George" arr[1] = "John" arr[2] = "Thomas" document.write( arr.join() ) </script>
运行结果：
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>
运行结果：
George.John.Thomas
split()
split() 方法用于把一个字符串分割成字符串数组。
<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>
运行结果：
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(":") //将返回["2", "3", "4", "5"]
"|a|b|c".split("|") //将返回["", "a", "b", "c"]
"hello".split("") //可返回 ["h", "e", "l", "l", "o"]
"hello".split("", 3) //可返回 ["h", "e", "l"]
slice()
slice() 方法可从已有的数组中返回选定的元素。
<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>
运行结果：
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>
运行结果：
George,John,Thomas,James,Adrew,Martin
Thomas,James
George,John,Thomas,James,Adrew,Martin
splice()
splice() 方法向/从数组中添加/删除项目，然后返回被删除的项目。
注释：该方法会改变原始数组。
<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>
运行结果：
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>
运行结果：
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>
运行结果：
George,John,Thomas,James,Adrew,Martin
George,John,William,Martin
感兴趣的朋友可以使用在线HTML/CSS/JavaScript代码运行工具：测试运行一下文中所述代码。
更多关于JavaScript相关内容可查看本站专题：《》、《》、《》、《》、《》及《》
希望本文所述对大家JavaScript程序设计有所帮助。